Chapter I: O U (2)

Defn: The third joint or the antennæ of the Crustacea.

ISCHION; ISCHIUM Is"chi*on, Is"chi*um, n. Etym: [L., Gr.

1. (Anat.)

Defn: The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.

2. (Zoöl.)

Defn: One of the pleuræ of insects.

ISCHIOPODITE Is`chi*op"o*dite, n. Etym: [Gr. (Zoöl.)

Defn: The third joint of the typical appendages of Crustacea.

ISCHIORECTAL Is`chi*o*rec"tal, a. Etym: [Ischium + rectal.] (Anat.)

Defn: Of or pertaining to the region between the rectum and ishial tuberosity.

ISCHURETIC Is`chu*ret"ic, a.

Defn: Having the quality of relieving ischury. -- n.

Defn: An ischuretic medicine.

ISCHURY Is"chu*ry, n. Etym: [L. ischuria, Gr. ischurie.] (Med.)

Defn: A retention or suppression of urine.

-ISE -ise

Defn: . See -ize.

ISENTROPIC I`sen*trop"ic, a. Etym: [Is- + entropy + -ic.] (Physics)

Defn: Having equal entropy. Isentropic lines, lines which pass through points having equal entropy.

ISETHIONIC I*seth`i*on"ic, a. Etym: [Is- + ethionic.] (Chem.)

Defn: Pertaining to, derived from, or designating, an acid, HO.C2H4.SO3H, obtained as an oily or crystalline substance, by the action of sulphur trioxide on alcohol or ether. It is derivative of sulphuric acid.

-ISH -ish. Etym: [AS. -isc; akin to G. -isch, OHG. -isc, Goth. & Dan. - isk, Gr. -esque.]

Defn: A suffix used to from adjectives from nouns and from adjectives. It denotes relation, resemblance, similarity, and sometimes has a diminutive force; as, selfish, boyish, brutish; whitish, somewhat white.

-ISH -ish. Etym: [OE. -issen, fr. F. -is, -iss- (found in the present particle, etc., of certain verbs, as finir to finish, fleurir to flourish), corresponding to L. -escere, an inchoative ending.]

Defn: A verb ending, originally appearing in certain verbs of French origin; as, abolish, cherish, finish, furnish, garnish, impoverish.

ISHMAELITE Ish"ma*el*ite, n.

1. A descendant of Ishmael (the son of Abraham and Hagar), of whom it was said, "His hand will be against every man, and every man's hand against him." Gen. xvi. 12.

2. One at enmity with society; a wanderer; a vagabond; an outcast. Thackeray.

3. See Ismaelian.

ISHMAELITISH Ish"ma*el*i`tish, a.

Defn: Of, pertaining to, or resembling, an Ishmaelite or the Ishmaelites.

ISIAC I"si*ac, a. Etym: [L. Isiacus, Gr.

Defn: Pertaining to the goddess Isis; as, Isiac mysteries.

ISICLE I"si*cle, n.

Defn: A icicle. [Obs.]

ISIDORIAN Is`i*do"ri*an, a.

Defn: Pertaining, or ascribed, to Isidore; as, the Isidorian decretals, a spurious collection of decretals published in the ninth century.

ISINGLASS I"sin*glass, n. Etym: [Prob. corrupted fr. D. huizenblas (akin to G. hausenblase), lit., bladder of the huso, or large sturgeon; huizen sturgeon + blas bladder. Cf. Bladder, Blast a gust of wind.]

1. A semitransparent, whitish, and very pure from of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso) found in the of Western Russia. It used for making jellies, as a clarifier, etc. Cheaper forms of gelatin are not unfrequently so called. Called also fish glue.

2. (Min.)

Defn: A popular name for mica, especially when in thin sheets.

ISIS I"sis, n. Etym: [L., the goddess Isis, fr. Gr.

1. (Myth.)

Defn: The principal goddess worshiped by the Egyptians. She was regarded as the mother of Horus, and the sister and wife of Osiris. The Egyptians adored her as the goddess of fecundity, and as the great benefactress of their country, who instructed their ancestors in the art of agriculture.

2. (Zoöl.)

Defn: Any coral of the genus Isis, or family Isidæ, composed of joints of white, stony coral, alternating with flexible, horny joints. See Gorgoniacea.

3. (Astron.)

Defn: One of the asteroids.

ISLAM Is"lam, n. Etym: [Ar. islam obedience to the will of God, submission, humbling one's self, resigning one's self to the divine disposal. Cf. Moslem.]

1. The religion of the Mohammedans; Mohammedanism; Islamism. Their formula of faith is: There is no God but Allah, and Mohammed is his prophet.

2. The whole body of Mohammedans, or the countries which they occupy.

ISLAMISM Is"lam*ism, n. Etym: [Cf. F. islamisme.]

Defn: The faith, doctrines, or religious system of the Mohammedans; Mohammedanism; Islam.

ISLAMITE Is"lam*ite, n.

Defn: A Mohammedan.

ISLAMITIC Is`lam*it"ic, a.

Defn: Of or pertaining to Islam; Mohammedan.

ISLAMIZE Is"lam*ize, v. i. & t. [imp. & p. p. Islamized; p. pr. & vb. n. Islamizing.]

Defn: To conform, or cause to conform, to the religion of Islam.

ISLAND Is"land, n. Etym: [OE. iland, yland, AS. igland, , ; ig, , island + land, lond, land. AS. ig, , is akin to AS. eá water, river, OHG. , G. au meadow, Icel. ey island, Dan. & Sw. ö, Goth. ahwa a stream, water, L. aqua water. The s is due to confusion with isle. Cf. Ait, Eyot, Ewer, Aquatic.]

1. A tract of land surrounded by water, and smaller than a continent. Cf. Continent.

2. Anything regarded as resembling an island; as, an island of ice.

3. (Zoöl.)

Defn: See Isle, n., 2. Islands of the blessed (Myth.), islands supposed to lie in the Western Ocean, where the favorites of the gods are conveyed at death, and dwell in everlasting joy.

ISLAND Is"land, v. t.

1. To cause to become or to resemble an island; to make an island or islands of; to isle. Shelley.

2. To furnish with an island or with islands; as, to island the deep. Southey.

ISLANDER Is"land*er, n.

Defn: An inhabitant of an island.

ISLANDY Is"land*y, a.

Defn: Of or pertaining to islands; full of islands. Cotgrave.

ISLE Isle, n. Etym: [Obs.]

Defn: See Aisle.

ISLE Isle, n. Etym: [OF. isle, F. île, L. insula; cf. Lith. sala. Cf. Insulate.]

1. An island. [Poetic] Imperial rule of all the seagirt isles. Milton.

2. (Zoöl.)

Defn: A spot within another of a different color, as upon the wings of some insects.

ISLE Isle, v. t.

Defn: To cause to become an island, or like an island; to surround or encompass; to island. [Poetic] Isled in sudden seas of light. Tennyson.

ISLET Is"let, n. Etym: [OF. islette (cf. F. îlot), dim. of isle.]

Defn: A little island.

-ISM -ism. Etym: [F. -isme, or L. -ismus, Gr.

Defn: A suffix indicating an act, a process, the result of an act or a process, a state; also, a characteristic (as a theory, doctrine, idiom, etc.); as, baptism, galvanism, organism, hypnotism, socialism, sensualism, Anglicism.

ISM Ism, n. Etym: [See ism, above.]

Defn: A doctrine or theory; especially, a wild or visionary theory. E. Everett. The world grew light-headed, and forth came a spawn of isms which no man can number. S. G. Goodrich.

ISMAELIAN; ISMAELITE Is`ma*e"li*an, Is"ma*el*ite, n. (Eccl.)

Defn: One of a sect of Mohammedans who favored the pretensions of the family of Mohammed ben Ismael, of the house Ali.

ISO-; IS- I"so-, Is-.Etym: [Gr. 'i`sos equal.]

Defn: A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif.: (a) (Chem.) Applied to certain compounds having the same composition but different properties; as in isocyanic. (b) (Organic Chem.) Applied to compounds of certain isomeric series in whose structure one carbon atom, at least, is connected with three other carbon atoms; -- contrasted with neo- and normal; as in isoparaffine; isopentane.

ISOBAR I"so*bar, n. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line. [Written also isobare.]

ISOBAR I"so*bar, n.

Defn: The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science.

ISOBARIC I`so*bar"ic, a. (Phys. Geog.)

Defn: Denoting equal pressure; as, an isobaric line; specifically, of or pertaining to isobars.

ISOBARISM I"so*bar*ism, n.

Defn: The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science.

ISOBAROMETRIC I`so*bar`o*met"ric, a. Etym: [Iso + barometric.] (Phys. Geog.)

Defn: Indicating equal barometric pressure.

ISOBATHYTHERM I`so*bath"y*therm, n. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: A line connecting the points on the surface of the earth where a certain temperature is found at the same depth.

ISOBATHYTHERMIC I`so*bath"y*ther"mic, a.

Defn: Of or pertaining to an isobathytherm; possessing or indicating the same temperature at the same depth.

ISOBRONT I"so*bront (i"so*bront), n. [Iso- + Gr. bronth` thunder.] (Meteor.)

Defn: An imaginary line, or a line on a chart, marking the simultaneous development of a thunderstorm, as noted by observing the time when the thunder is heard at different places.

ISOCEPHALISM I`so*ceph"a*lism, n. Etym: [From Gr. Iso-, and Cephalon.] (Art)

Defn: A peculiarity in the design of bas-relief by which the heads of human figures are kept at the same height from the ground, whether the personages are seated, standing, or mounted on horseback; -- called also isokephaleia.

ISOCHASM I"so*chasm, n. Etym: [Iso- + chasm.] (Phys. Geog.)

Defn: A line connecting places on the earth's surface at which there is the same mean frequency of auroras.

ISOCHASMIC I`so*chas"mic, a.

Defn: Indicating equal auroral display; as, an isochasmic line.

ISOCHEIM I"so*cheim, n. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: A line connecting places on the earth having the same mean winter temperature. Cf. Isothere.

ISOCHEIMAL; ISOCHIMAL I`so*chei"mal, I`so*chi"mal, a.

Defn: Pertaining to, having the nature of, or making, isocheims; as, an isocheimal line; an isocheimal chart.

ISOCHEIMENAL; ISOCHIMENAL I`so*chei"me*nal, I`so*chi"me*nal a.

Defn: The same as Isocheimal.

ISOCHEIMIC I`so*chei"mic, a.

Defn: The same as Isocheimal.

ISOCHIMENE I`so*chi"mene, n.

Defn: The same as Isocheim.

ISOCHOR I"so*chor, n. [Iso- + Gr. xhw`ra space.] (Physics)

Defn: A line upon a thermodynamic diagram so drawn as to represent the pressures corresponding to changes of temperature when the volume of the gas operated on is constant. -- I`so*chor"ic (#), a.

ISOCHROMATIC I`so*chro*mat"ic, a. Etym: [Iso- + chromatic.] (Opt.)

Defn: Having the same color; connecting parts having the same color, as lines drawn through certain points in experiments on the chromatic effects of polarized light in crystals.

ISOCHRONAL I*soch"ro*nal, a. Etym: [See Isochronous.]

Defn: Uniform in time; of equal time; performed in equal times; recurring at regular intervals; isochronal vibrations or oscillations.

ISOCHRONIC I`so*chron"ic, a.

Defn: Isochronal.

ISOCHRONISM I*soch"ro*nism, n.

Defn: The state or quality of being isochronous.

ISOCHRONIZE I*soch"ro*nize, v. t. [imp. & p. p. -nized; p. pr. & vb. n. - nizing.] [See Isochronous.]

Defn: To make, or tend to make (the motion of a moving body), uniform in rate of rotation, or in frequency of vibration.

ISOCHRONON I*soch"ro*non, n. Etym: [NL. See Isochronous.]

Defn: A clock that is designed to keep very accurate time.

ISOCHRONOUS I*soch"ro*nous, a. Etym: [Gr.

Defn: Same as Isochronal.

ISOCHROOUS I*soch"ro*ous, a. Etym: [Iso- + Gr.

Defn: Having the same tint or color throughout; uniformly or evenly colored.

ISOCLINAL; ISOCLINIC I`so*cli"nal, I`so*clin"ic, a. Etym: [Iso- + Gr.

Defn: Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip. Isoclinal lines (Magnetism), lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip.

ISOCRYMAL I`so*cry"mal, a. (Phys. Geog.)

Defn: Pertaining to, having the nature of, or illustrating, an isocryme; as, an isocrymal line; an isocrymal chart.

ISOCRYME I"so*cryme, n. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: A line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.

ISOCRYMIC I`so*crym"ic, a.

Defn: Isocrymal.

ISOCYANIC I`so*cy*an"ic, a. Etym: [Iso- + cyanic.] (Chem.)

Defn: Designating an acid isomeric with cyanic acid. Isocyanic acid, an acid metameric with cyanic acid, and resembling it in its salts. It is obtained as a colorless, mobile, unstable liquid by the heating cyanuric acid. Called technically carbimide.

ISOCYANURIC I`so*cy`a*nu"ric, a. Etym: [Iso- + cyanuric.] (Chem.)

Defn: Designating, or pertaining to, an acid isomeric with cyanuric acid, and called also fulminuric acid. See under Fulminuric.

ISODIABATIC I`so*di`a*bat"ic, a. Etym: [Iso- + Gr. (Physics)

Defn: Pertaining to the reception or the giving out of equal quantities of heat by a substance. Rankine. Isodiabatic lines or curves, a pair of lines or curves exhibiting, on a diagram of energy, the law of variation of the pressure and density of a fluid, the one during the lowering, and the other during the raising, of its temperature, when the quantity of heat given out by the fluid during any given stage of the one process is equal to the quantity received during the corresponding stage of the other. Such lines are said to be isodiabatic with respect to each other. Compare Adiabatic.

ISODIAMETRIC I`so*di`a*met"ric, a. Etym: [Iso- + diametric.]

1. (Crystallog.)

Defn: Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.

2. (Bot.)

Defn: Having the several diameters nearly equal; -- said of the cells of ordinary parenchyma.

ISODIMORPHIC I`so*di*mor"phic, a. Etym: [Iso- + dimorphic.]

Defn: Isodimorphous.

ISODIMORPHISM I`so*di*mor"phism, n.

Defn: Isomorphism between the two forms severally of two dimorphous substances.

ISODIMORPHOUS I`so*di*mor"phous, a. Etym: [Iso- + dimorphous.]

Defn: Having the quality of isodimorphism.

ISODROME I"so*drome, n. [Iso- + Gr. course.] (Nav.)

Defn: A method of moving a fleet from one formation to another, the direction usually being changed eight points (90º), by means of paths of equal length for each ship. It is prohibited in the United States navy.

ISODULCITE I`so*dul"cite, n. Etym: [Iso- + dulcite.] (Chem.)

Defn: A white, crystalline, sugarlike substance, obtained by the decomposition of certain glucosides, and intermediate in nature between the hexacid alcohols (ductile, mannite, etc.) and the glucoses.

ISODYNAMIC I`so*dy*nam"ic, a. Etym: [Iso- + dynamic.]

Defn: Of, pertaining to, having, or denoting, equality of force. Isodynamic foods (Physiol.), those foods that produce a similar amount of heat. -- Isodynamic lines (Magnetism), lines on the earth's surface connecting places at which the magnetic intensity is the same.

ISODYNAMOUS I`so*dy"na*mous, a. Etym: [Gr. Isodynamic.]

Defn: Of equal force or size.

ISOGEOTHERM I`so*ge"o*therm, n. Etym: [Iso- + Gr. gh^ the earth + qe`rmh heat.] (Phys. Geog.)

Defn: A line or curved surface passing beneath the earth's surface through points having the same mean temperature.

ISOGEOTHERMAL; ISOGEOTHERMIC I`so*ge`o*ther"mal, I`so*ge`o*ther"mic, a.

Defn: Pertaining to, having the nature of, or marking, isogeotherms; as, an isogeothermal line or surface; as isogeothermal chart. -- n.

Defn: An isogeotherm.

ISOGONIC I`so*gon"ic, a. Etym: [Iso- + Gr.

Defn: Pertaining to, or noting, equal angles. Isogonic lines (Magnetism), lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same.

ISOGONIC I`so*gon"ic, a. (Zoöl.)

Defn: Characterized by isogonism.

ISOGONISM I*sog"o*nism, n. Etym: [Iso- + Gr. (Zoöl.)

Defn: The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.

ISOGRAPHIC I`so*graph"ic, a.

Defn: Of or pertaining to isography.

ISOGRAPHY I*sog"ra*phy, n. Etym: [Iso- + -graphy.]

Defn: Imitation of another's handwriting,

ISOHYETOSE I`so*hy"e*tose`, a. Etym: [Iso- + Gr. "yeto`s rain.] (Phys. Geog.)

Defn: Of or pertaining to lines connecting places on the earth's surface which have a mean annual rainfall. -- n.

Defn: An isohyetose line.

ISOLABLE I"so*la*ble, a. Etym: [See Isolate.] (Chem.)

Defn: Capable of being isolated, or of being obtained in a pure state; as, gold is isolable.

ISOLATE I"so*late, v. t. [imp. & p. p. Isolated; p. pr. & vb. n. Isolating.] Etym: [It. isolato, p. p. of isolare to isolate, fr. isola island, L. insula. See 2d Isle, and cf. Insulate.]

1. To place in a detached situation; to place by itself or alone; to insulate; to separate from others. Short isolated sentences were the mode in which ancient wisdom delighted to convey its precepts. Bp. Warburton.

2. (Elec.)

Defn: To insulate. See Insulate.

3. (Chem.)

Defn: To separate from all foreign substances; to make pure; to obtain in a free state.

ISOLATED I"so*la`ted, a.

Defn: Placed or standing alone; detached; separated from others. Isolated point of a curve. (Geom.) See Acnode.

ISOLATEDLY I"so*la`ted*ly, adv.

Defn: In an isolated manner.

ISOLATION I`so*la"tion, n. Etym: [Cf. F. isolation.]

Defn: The act of isolating, or the state of being isolated; insulation; separation; loneliness. Milman.

ISOLATOR I"so*la`tor, n.

Defn: One who, or that which, isolates.

ISOLOGOUS I*sol"o*gous, a. Etym: [Iso- + Gr. (Chem.)

Defn: Having similar proportions, similar relations, or similar differences of composition; -- said specifically of groups or series which differ by a constant difference; as, ethane, ethylene, an acetylene, or their analogous compounds, form an isologous series.

ISOMER I"so*mer, n. Etym: [See Isomeric.] (Chem.)

Defn: A body or compound which is isomeric with another body or compound; a member of an isomeric series.

ISOMERE I"so*mere, n. [Iso- + -mere.] (Zoöl.)

1. A homologous or corresponding part or segment.

2. (Chem.) = Isomer.

ISOMERIC I`so*mer"ic, a. Etym: [Iso- + Gr. isomérique.] (Chem.)

Defn: Having the same percentage composition; -- said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with. Specif.: (a) Polymeric; i. e., having the same elements united in the same proportion by weight, but with different molecular weights; as, acetylene and benzine are isomeric (polymeric) with each other in this sense. See Polymeric. (b) Metameric; i. e., having the same elements united in the same proportions by weight, and with the same molecular weight, but which a different structure or arrangement of the ultimate parts; as, ethyl alcohol and methyl ether are isomeric (metameric) with each other in this sense. See Metameric.

ISOMERIDE I*som"er*ide, n. (Chem.)

Defn: An isomer. [R.]

ISOMERISM I*som"er*ism, n. (Chem.)

Defn: The state, quality, or relation, of two or more isomeric substances. Physical isomerism (Chem.), the condition or relation of certain (metameric) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and lævo-tartaric acids. In such compounds there is usually at least one unsymmetrical carbon atom. See Unsymmetrical.

ISOMEROMORPHISM I`so*mer`o*mor"phism, n. Etym: [Isomer + Gr. ism.] (Crystallog.)

Defn: Isomorphism between substances that are isomeric.

ISOMETRIC; ISOMETRICAL I`so*met"ric, I`so*met"ric*al, a. Etym: [Iso- + Gr.

1. Pertaining to, or characterized by, equality of measure.

2. (Crystallog.)

Defn: Noting, or conforming to, that system of crystallization in which the three axes are of equal length and at right angles to each other; monometric; regular; cubic. Cf. Crystallization. Isometric lines (Thermodynamics), lines representing in a diagram the relations of pressure and temperature in a gas, when the volume remains constant. -- Isometrical perspective. See under Perspective. -- Isometrical projection, a species of orthographic projection, in which but a single plane of projection is used. It is so named from the fact that the projections of three equal lines, parallel respectively to three rectangular axes, are equal to one another. This kind of projection is principally used in delineating buildings or machinery, in which the principal lines are parallel to three rectangular axes, and the principal planes are parallel to three rectangular planes passing through the three axes.

ISOMORPH I"so*morph, n. Etym: [See Isomorphous.]

Defn: A substance which is similar to another in crystalline form and composition.

ISOMORPHIC I`so*mor"phic, a.

Defn: Isomorphous.

ISOMORPHISM I`so*mor"phism, n. Etym: [Cf. F. isomorphisme.] (Crystallog.)

Defn: A similarity of crystalline form between substances of similar composition, as between the sulphates of barium (BaSO4) and strontium (SrSO4). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called homoeomorphism.

ISOMORPHOUS I`so*mor"phous, a. Etym: [Iso- + -morphous.]

Defn: Having the quality of isomorphism.

ISONANDRA I`so*nan"dra, n. Etym: [Iso- + Gr. (Bot.)

Defn: A genus of sapotaceous trees of India. Isonandra Gutta is the principal source of gutta-percha.

ISONEPHELIC I`so*ne*phel"ic, a. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: Having, or indicating, an equal amount of cloudiness for a given period; as, isonephelic regions; an isonephelic line.

ISONICOTINE I`so*nic"o*tine, n. Etym: [Iso- + nicotine.] (Chem.)

Defn: A crystalline, nitrogenous base, C10H14N2, isomeric with nicotine.

ISONICOTINIC I`so*nic`o*tin"ic, a. (Chem.) (a) Pertaining to, or derived from, isonicotine. (b) Pertaining to, or designating, an acid isomeric with nicotinic acid.

ISONITROSO- I`so*ni*tro"so-. Etym: [Iso- + nitroso-.] (Chem.)

Defn: A combining from (also used adjectively), signifying: Pertaining to, or designating, the characteristic, nitrogenous radical, NOH, called the isonitroso group.

ISONOMIC I`so*nom"ic, a. Etym: [Gr.

Defn: The same, or equal, in law or right; one in kind or origin; analogous; similar. Dana.

ISONOMY I*son"o*my, n. Etym: [Gr. isonomie. See Isonomic.]

Defn: Equal law or right; equal distribution of rights and privileges; similarity.

ISOPATHY I*sop"a*thy, n. Etym: [Iso- + Gr. (Med.) (a) The system which undertakes to cure a disease by means of the virus of the same disease. (b) The theory of curing a diseased organ by eating the analogous organ of a healthy animal. Mayne. (c) The doctrine that the power of therapeutics is equal to that of the causes of disease.

ISOPEPSIN I`so*pep"sin, n. Etym: [Iso- + pepsin.] (Physiol. Chem.)

Defn: Pepsin modified by exposure to a temperature of from 40º to 60º C.

ISOPERIMETRICAL I`so*per`i*met"ric*al, a. Etym: [Gr. isopérimètre. See Perimeter.] (Geom.)

Defn: Having equal perimeters of circumferences; as, isoperimetrical figures or bodies.

ISOPERIMETRY I`so*per*im"e*try, n. (Geom.)

Defn: The science of figures having equal perimeters or boundaries.

ISOPIESTIC I`so*pi*es"tic, a. Etym: [Iso- + Gr. (Thermodynamics)

Defn: Having equal pressure. Isopiestic lines, lines showing, in a diagram, the relations of temperature and volume, when the elastic force is constant; -- called also isobars.

ISOPLEURA I`so*pleu"ra, n. pl. Etym: [NL. See Iso-, and Pleura.] (Zoöl.)

Defn: A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.

Note: The intestine terminates at the posterior end of the body, and the gills and circulatory and reproductive organs are paired. It includes the chitons (Polyplacophora), together with Neomenia and Chætoderma, which are wormlike forms without a shell.

ISOPOD I"so*pod, a. (Zoöl.)

Defn: Having the legs similar in structure; belonging to the Isopoda. -- n.

Defn: One of the Isopoda.

ISOPODA I*sop"o*da, n. pl. Etym: [NL. See Iso-, and -poda.] (Zoöl.)

Defn: An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.

Note: The body is usually depressed, with the abdominal segments short, and often consolidated in part. The branchiæ are on the abdominal appendages. The group includes the terrestrial pill bugs and sow bugs, with numerous marine forms. See Arthrostrata, Gribble.

ISOPODIFORM I`so*pod"i*form, a. Etym: [Isopod + -form.] (Zoöl.)

Defn: Having the shape of an isopod; -- said of the larvæ of certain insects.

ISOPODOUS I*sop"o*dous, a.

Defn: Same as Isopod.

ISOPOGONOUS I`so*pog"o*nous, a. Etym: [Iso- + Gr. (Zoöl.)

Defn: Having the two webs equal in breath; -- said of feathers.

ISOPRENE I"so*prene, n. Etym: [Etymol. uncertain.] (Chem.)

Defn: An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha.C5H8 -- unsaturated, and used to make synthetic rubber by polymerization. In organic chemistry, viewed conceptually as the building block of the terpene series of hydrocarbons

ISOPYCNIC I`so*pyc"nic, a. Etym: [Iso- + Gr. pykno`s dense.] (Physics)

Defn: Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface.

ISOPYCNIC I`so*pyc"nic, n. (Physics)

Defn: A line or surface passing through those points in a medium, at which the density is the same.

ISORCIN I*sor"cin, n. Etym: [Iso- + orcin.] (Chem.)

Defn: A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially; -- called also cresorcin.

ISORROPIC I`sor*rop"ic, a. Etym: [Gr. 'iso`rropos in equipoise; 'i`sos equal + "roph` downward inclination or momentum.]

Defn: Of equal value. Isorropic line (in a diagram) (Geom.), the locus of all the points for which a specified function has a constant value. Newcomb.

ISOSCELES I*sos"ce*les, a. Etym: [L., fr. Gr. 'i`sos equal + (Geom.)

Defn: Having two legs or sides that are equal; -- said of a triangle.

ISOSPONDYLI I`so*spon"dy*li, n. pl. Etym: [NL., fr. Gr. 'i`sos equal + (Zoöl.)

Defn: An extensive order of fishes, including the salmons, herrings, and many allied forms.

ISOSPONDYLOUS I`so*spon"dy*lous, a. (Zoöl.)

Defn: Of or pertaining to the Isospondyli; having the anterior vertebræ separate and normal.

ISOSPORE I"so*spore, n. (Biol.) (a) One of the spores produced by an isosporous organism. (b) A zygospore.

ISOSPORIC I`so*spor"ic, a. Etym: [Iso- + Gr. (Bot.)

Defn: Producing but one kind of spore, as the ferns and Equiseta. Cf. Heterosporic.

ISOSPOROUS I*sos"po*rous, a. [Iso- + Gr. fruit.] (Biol.)

Defn: Producing but one kind of spore, as the ferns.

ISOSTASY I*sos"ta*sy, n. [See Iso-; Stasis.]

Defn: The state or quality of being isostatic. Specif. (Geol.),

Defn: general equilibrium in the earth's crust, supposed to be maintained by the yielding or flow of rock material beneath the surface under gravitative stress. By the theory of isostasy each unit column of the earth, from surface to center, has approximately the same weight, and the continents stand higher than the ocean beds chiefly because the material of the crust has there less density.

ISOSTATIC I`so*stat"ic, a. [Iso- + static.] (Physics & Geol.)

Defn: Subjected to equal pressure from every side; being in hydrostatic equilibrium, as a body submerged in a liquid at rest; pertaining to, or characterized by, isostasy.

ISOSTEMONOUS I`so*stem"o*nous, a. Etym: [Iso- + Gr. (Bot.)

Defn: Having exactly as many stamens as petals.

ISOSTEMONY I`so*stem"o*ny, n. (Bot.)

Defn: The quality or state of being isostemonous.

ISOSULPHOCYANATE I`so*sul`pho*cy"a*nate, n. (Chem.)

Defn: A salt of isosulphocyanic acid.

ISOSULPHOCYANIC I`so*sul`pho*cy*an"ic, a. (Chem.)

Defn: Pertaining to, or designating, an acid, HNCS, isomeric with sulphocyanic acid.

ISOTHERAL I*soth"er*al, a.

Defn: Having the nature of an isothere; indicating the distribution of temperature by means of an isothere; as, an isotheral chart or line.

ISOTHERE I"so*there, n. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: A line connecting points on the earth's surface having the same mean summer temperature.

ISOTHERM I"so*therm, n. Etym: [Iso- + Gr. (Phys. Geog.)

Defn: A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.

ISOTHERMAL I`so*ther"mal, a. Etym: [Cf. F. isotherme.] (a) Relating to equality of temperature. (b) (Phys. Geog.) Having reference to the geographical distribution of temperature, as exhibited by means of isotherms; as, an isothermal line; an isothermal chart. Isothermal line. (a) An isotherm. (b) A line drawn on a diagram of energy such that its ordinates represent the pressures of a substance corresponding to various volumes, while the absolute temperature is maintained at a constant value. -- Isothermal zones, spaces on opposite sides of the equator having the same mean temperature, and bounded by corresponding isothermal lines.

ISOTHERMOBATH I`so*ther"mo*bath, n. Etym: [Iso- + Gr. (Phys. Geog)

Defn: A line drawn through points of equal temperature in a vertical section of the ocean.

ISOTHERMOBATHIC I`so*ther`mo*bath"ic, a.

Defn: Of or pertaining to an isothermobath; possessing or indicating equal temperatures in a vertical section, as of the ocean.

ISOTHEROMBROSE I*soth`er*om"brose, n. Etym: [Iso- + Gr. qe`ros summer + 'o`mbros rain.] (Phys. Geog)

Defn: A line connecting or marking points on the earth's surface, which have the same mean summer rainfall.

ISOTONIC I`so*ton"ic, a. Etym: [Iso- + tonic.]

Defn: Having or indicating, equal tones, or tension. Isotonic system (Mus.), a system consisting of intervals, in which each concord is alike tempered, and in which there are twelve equal semitones.

ISOTRIMORPHIC I`so*tri*mor"phic, a.

Defn: Isotrimorphous.

ISOTRIMORPHISM I`so*tri*mor"phism, n. Etym: [Iso- + Gr.

Defn: Isomorphism between the three forms, severally, of two trimorphous substances.

ISOTRIMORPHOUS I`so*tri*mor"phous, a.

Defn: Having the quality of isotrimorphism; isotrimorphic.

ISOTROPIC I`so*trop"ic, a. Etym: [Iso- + Gr. (Physics)

Defn: Having the same properties in all directions; specifically, equally elastic in all directions.

ISOTROPISM I*sot"ro*pism, n.

Defn: Isotropy.

ISOTROPOUS I*sot"ro*pous, a.

Defn: Isotropic.

ISOTROPY I*sot"ro*py, n. (Physics)

Defn: Uniformity of physical properties in all directions in a body; absence of all kinds of polarity; specifically, equal elasticity in all directions.

ISOURIC I`so*u"ric, a. Etym: [Iso- + uric.] (Chem.)

Defn: Pertaining to, or designating, a complex nitrogenous acid, isomeric with uric acid.

ISRAELITE Is"ra*el*ite, n. Etym: [L. Israëlites, Gr. Yisra, i. e., champion of God; sarah to fight + God.]

Defn: A descendant of Israel, or Jacob; a Hebrew; a Jew.

ISRAELITIC; ISRAELITISH Is`ra*el*it"ic, Is"ra*el*i`tish, a.

Defn: Of or pertaining to Israel, or to the Israelites; Jewish; Hebrew.

ISSUABLE Is"su*a*ble, a. Etym: [From Issue.]

1. Leading to, producing, or relating to, an issue; capable of being made an issue at law. Burrill.

2. Lawful or suitable to be issued; as, a writ issuable on these grounds. Issuable plea (Law), a plea to the merits, on which the adverse party may take issue and proceed to trial.

ISSUABLY Is"su*a*bly, adv.

Defn: In an issuable manner; by way of issue; as, to plead issuably.

ISSUANCE Is"su*ance, n.

Defn: The act of issuing, or giving out; as, the issuance of an order; the issuance of rations, and the like.

ISSUANT Is"su*ant, a. (Her.)

Defn: Issuing or coming up; -- a term used to express a charge or bearing rising or coming out of another.

ISSUE Is"sue, n. Etym: [OF. issue, eissue, F. issue, fr. OF. issir, eissir, to go out, L. exire; ex out of, from + ire to go, akin to Gr. i., Goth. iddja went, used as prefect of gaggan to go. Cf. Ambition, Count a nobleman, Commence, Errant, Exit, Eyre, Initial, Yede went.]

1. The act of passing or flowing out; a moving out from any inclosed place; egress; as, the issue of water from a pipe, of blood from a wound, of air from a bellows, of people from a house.

2. The act of sending out, or causing to go forth; delivery; issuance; as, the issue of an order from a commanding officer; the issue of money from a treasury.

3. That which passes, flows, or is sent out; the whole quantity sent forth or emitted at one time; as, an issue of bank notes; the daily issue of a newspaper.

4. Progeny; a child or children; offspring. In law, sometimes, in a general sense, all persons descended from a common ancestor; all lineal descendants. If the king Should without issue die. Shak.

5. Produce of the earth, or profits of land, tenements, or other property; as, A conveyed to B all his right for a term of years, with all the issues, rents, and profits.

6. A discharge of flux, as of blood. Matt. ix. 20.

7. (Med.)

Defn: An artificial ulcer, usually made in the fleshy part of the arm or leg, to produce the secretion and discharge of pus for the relief of some affected part.

8. The final outcome or result; upshot; conclusion; event; hence, contest; test; trial. Come forth to view The issue of the exploit. Shak. While it is hot, I 'll put it to the issue. Shak.

9. A point in debate or controversy on which the parties take affirmative and negative positions; a presentation of alternatives between which to choose or decide.

10. (Law)

Defn: In pleading, a single material point of law or fact depending in the suit, which, being affirmed on the one side and denied on the other, is presented for determination. See General issue, under General, and Feigned issue, under Feigned. Blount. Cowell. At issue, in controversy; disputed; opposing or contesting; hence, at variance; disagreeing; inconsistent. As much at issue with the summer day As if you brought a candle out of doors. Mrs. Browning. -- Bank of issue, Collateral issue, etc. See under Bank, Collateral, etc. -- Issue pea, a pea, or a similar round body, used to maintain irritation in a wound, and promote the secretion and discharge of pus. -- To join, or take, issue, to take opposing sides in a matter in controversy.

ISSUE Is"sue, v. i. [imp. & p. p. Issued; p. pr. & vb. n. Issuing.]

1. To pass or flow out; to run out, as from any inclosed place. From it issued forced drops of blood. Shak.

2. To go out; to rush out; to sally forth; as, troops issued from the town, and attacked the besiegers.

3. To proceed, as from a source; as, water issues from springs; light issues from the sun.

4. To proceed, as progeny; to be derived; to be descended; to spring. Of thy sons that shall issue from thee. 2 Kings xx. 18.

5. To extend; to pass or open; as, the path issues into the highway.

6. To be produced as an effect or result; to grow or accrue; to arise; to proceed; as, rents and profits issuing from land, tenements, or a capital stock.

7. To close; to end; to terminate; to turn out; as, we know not how the cause will issue.

8. (Law)

Defn: In pleading, to come to a point in fact or law, on which the parties join issue.

ISSUE Is"sue, v. t.

1. To send out; to put into circulation; as, to issue notes from a bank.

2. To deliver for use; as, to issue provisions.

3. To send out officially; to deliver by authority; as, to issue an order; to issue a writ.

ISSUELESS Is"sue*less, a.

Defn: Having no issue or progeny; childless. "The heavens . . . have left me issueless." Shak.

ISSUER Is"su*er, n.

Defn: One who issues, emits, or publishes.

-IST -ist. Etym: [Gr. iste.]

Defn: A noun suffix denoting an agent, or doer, one who practices, a believer in; as, theorist, one who theorizes; socialist, one who holds to socialism; sensualist, one given to sensuality.

IS'T Is't.

Defn: A contraction of is it.

ISTHMIAN Isth"mi*an, a. Etym: [L. Isthmius, Gr. Isthmus.]

Defn: Of or pertaining to an isthmus, especially to the Isthmus of Corinth, in Greece. Isthmian games (Gr. Antiq.), one of the four great national festivals of Greece, celebrated on the Isthmus of Corinth in the spring of every alternate year. They consisted of all kinds of athletic sports, wrestling, boxing, racing on foot and in chariots, and also contests in music and poetry. The prize was a garland of pine leaves.

ISTHMUS Isth"mus, n.; pl. Isthmuses. Etym: [L. isthmus, Gr. 'isqmo`s a neck, a neck of land between two seas, an isthmus, especially the Isthmus of Corinth; prob. from the root of 'ie`nai to go; cf. Icel. eiedh isthmus. See Issue.] (Geog.)

Defn: A neck or narrow slip of land by which two continents are connected, or by which a peninsula is united to the mainland; as, the Isthmus of Panama; the Isthmus of Suez, etc. Isthmus of the fauces. (Anat.) See Fauces.

ISTLE Is"tle, n.

Defn: Same as Ixtle.

ISURET I*su"ret, n. Etym: [Iso- + urea.] (Chem.)

Defn: An artificial nitrogenous base, isomeric with urea, and forming a white crystalline substance; -- called also isuretine.

IT It, pron. Etym: [OE. it, hit, AS. hit; cf. D. het. sq. root181. See He.]

Defn: The neuter pronoun of the third person, corresponding to the masculine pronoun he and the feminine she, and having the same plural (they, their of theirs, them).

Note: The possessive form its is modern, being rarely found in the writings of Shakespeare and Milton, and not at all in the original King James's version of the Bible. During the transition from the regular his to the anomalous its, it was to some extent employed in the possessive without the case ending. See His, and He. In Dryden's time its had become quite established as the regular form. The day present hath ever inough to do with it owne grief. Genevan Test. Do, child, go to it grandam, child. Shak. It knighthood shall do worse. It shall fright all it friends with borrowing letters. B. Jonson.

Note: In the course of time, the nature of the neuter sign i in it, the form being found in but a few words, became misunderstood. Instead of being looked upon as an affix, it passed for part of the original word. Hence was formed from it the anomalous genitive it, superseding the Saxon his. Latham. The fruit tree yielding fruit after his (its) kind. Gen. i. 11. It is used, --

1. As a substance for any noun of the neuter gender; as, here is the book, take it home.

2. As a demonstrative, especially at the beginning of a sentence, pointing to that which is about to be stated, named, or mentioned, or referring to that which apparent or well known; as, I saw it was John. It is I; be not afraid. Matt. xiv. 27. Peter heard that it was the Lord. John xxi. 7. Often, in such cases, as a substitute for a sentence or clause; as, it is thought he will come; it is wrong to do this.

3. As an indefinite nominative for a impersonal verb; as, it snows; it rains.

4. As a substitute for such general terms as, the state of affairs, the condition of things, and the like; as, how is it with the sick man Think on me when it shall be well with thee. Gen. xl. 14.

5. As an indefinite object after some intransitive verbs, or after a substantive used humorously as a verb; as, to foot it (i. e., to walk). The Lacedemonians, at the Straits of Thermopylæ, when their arms failed them, fought it out with nails and teeth. Dryden. Whether the charmer sinner it, or saint it, If folly grows romantic, I must paint it. Pope. Its self. See Itself.

ITACISM I"ta*cism, n. Etym: [Cf. F. itacisme. See Etacism, and cf. Iotacism.] (Greek Gram.)

Defn: Pronunciation of e in the English word be. This was the pronunciation advocated by ReuEtacism. In all such questions between a the confusing element of itacism comes in. Alford.

ITACIST I"ta*cist, n. Etym: [Cf. F. itaciste.]

Defn: One who is in favor of itacism.

ITACOLUMITE It`a*col"u*mite, n. Etym: [From Itacolumi, a mountain of Brazil.] (Min.)

Defn: A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found.

ITACONIC It`a*con"ic, a. Etym: [From aconitic, by transposition of the letters.] (Chem.)

Defn: Pertaining to, or designating, an acid, C5H6O4, which is obtained as a white crystalline substance by decomposing aconitic and other organic acids.

ITALA It"a*la, n. Etym: [Fem. of L. Italus Italian.]

Defn: An early Latin version of the Scriptures (the Old Testament was translated from the Septuagint, and was also called the Italic version).

ITALIAN I*tal"ian, a. Etym: [Cf. F. italien, It. italiano. Cf. Italic.]

Defn: Of or pertaining to Italy, or to its people or language. Italian cloth a light material of cotton and worsted; -- called also farmer's satin. -- Italian iron, a heater for fluting frills. -- Italian juice, Calabrian liquorice.

ITALIAN I*tal"ian, n.

1. A native or inhabitant of Italy.

2. The language used in Italy, or by the Italians.

ITALIANATE I*tal"ian*ate, v. t. Etym: [Cf. It. italianare.]

Defn: To render Italian, or conformable to Italian customs; to Italianize. [R.] Ascham.

ITALIANATE I*tal"ian*ate, a.

Defn: Italianized; Italianated. "Apish, childish, and Italianate." Marlowe.

ITALIANISM I*tal"ian*ism, n.

1. A word, phrase, or idiom, peculiar to the Italians; an Italicism.

2. Attachment to, or sympathy for, Italy.

ITALIANIZE I*tal"ian*ize, v. i. [imp. & p. p. Italianized; p. pr. & vb. n. Italianizing.] Etym: [Cf. F. italianiser, It. italianizzare.]

1. To play the Italian; to speak Italian. Cotgrave.

2. To render Italian in any respect; to Italianate. "An Englishman Italianized." Lowell.

ITALIC I*tal"ic, a. Etym: [L. Italicus: cf. F. italique. Cf. Italian.]

1. Relating to Italy or to its people.

2. Applied especially to a kind of type in which the letters do not stand upright, but slope toward the right; -- so called because dedicated to the States of Italy by the inventor, Aldus Manutius, about the year 1500. Italic languages, the group or family of languages of ancient Italy. -- Italic order (Arch.), the composite order. See Composite. -- Italic school, a term given to the Pythagorean and Eleatic philosophers, from the country where their doctrines were first promulgated. -- Italic version. See Itala.

ITALIC I*tal"ic, n.; pl. Italics (. (Print.)

Defn: An Italic letter, character, or type (see Italic, a., 2.); -- often in the plural; as, the Italics are the author's. Italic letters are used to distinguish words for emphasis, importance, antithesis, etc. Also, collectively, Italic letters.

ITALICISM I*tal"i*cism, n.

1. A phrase or idiom peculiar to the Italian language; to Italianism.

2. The use of Italics.

ITALICIZE I*tal"i*cize, v. t. & i. [imp. & p. p. Italicized; p. pr. & vb. n. Italicizing.]

Defn: To print in Italic characters; to underline written letters or words with a single line; as, to Italicize a word; Italicizes too much.

ITA PALM I"ta palm`. (Bot.)

Defn: A magnificent species of palm (Mauritia flexuosa), growing near the Orinoco. The natives eat its fruit and buds, drink its sap, and make thread and cord from its fiber.

ITCH Itch, v. i. [imp. & p. p. Itched; p. pr. & vb. n. Itching.] Etym: [OE. icchen, , AS. giccan; akin to D. jeuken, joken, G. jucken, OHG. jucchen.]

1. To have an uneasy sensation in the skin, which inclines the person to scratch the part affected. My mouth hath itched all this long day. Chaucer.

2. To have a constant desire or teasing uneasiness; to long for; as, itching ears. "An itching palm." Shak.

ITCH Itch, n.

1. (Med.)

Defn: An eruption of small, isolated, acuminated vesicles, produced by the entrance of a parasitic mite (the Sarcoptes scabei), and attended with itching. It is transmissible by contact.

2. Any itching eruption.

3. A sensation in the skin occasioned (or resembling that occasioned) by the itch eruption; -- called also scabies, psora, etc.

4. A constant irritating desire. An itch of being thought a divine king. Dryden. Baker's itch. See under Baker. -- Barber's itch, sycosis. -- Bricklayer's itch, an eczema of the hands attended with much itching, occurring among bricklayers. -- Grocer's itch, an itching eruption, being a variety of eczema, produced by the sugar mite (Tyrogluphus sacchari). -- Itch insect (Zoöl.), a small parasitic mite (Sarcoptes scabei) which burrows and breeds beneath the human skin, thus causing the disease known as the itch. See Illust. in Append. -- Itch mite. (Zoöl.) Same as Itch insect, above. Also, other similar mites affecting the lower animals, as the horse and ox. -- Sugar baker's itch, a variety of eczema, due to the action of sugar upon the skin. -- Washerwoman's itch, eczema of the hands and arms, occurring among washerwomen.

ITCHINESS Itch"i*ness, n.

Defn: The state of being itchy.

ITCHLESS Itch"less, a.

Defn: Free from itching.

ITCHY Itch"y, a.

Defn: Infected with the itch, or with an itching sensation. Cowper.

-ITE -ite. Etym: [From Gr.

1. A suffix denoting one of a party, a sympathizer with or adherent of, and the like, and frequently used in ridicule; as, a Millerite; a Benthamite.

2. A suffix used in naming minerals; as, chlorite, from its characteristic green color; barite, from its heaviness; graphite, from its use in writing.

3. (Chem.)

Defn: A suffix used to denote the salts formed from those acids whose names end in -ous; as, sulphite, from sulphurous; nitrite, from nitrous acid, etc.

ITEM I"tem, adv. Etym: [L. See Iterate.]

Defn: Also; as an additional article.

ITEM I"tem, n. Etym: [From Item, adv.]

1. An article; a separate particular in an account; as, the items in a bill.

2. A hint; an innuendo. [Obs.] A secret item was given to some of the bishops . . . to absent themselves. Fuller.

3. A short article in a newspaper; a paragraph; as, an item concerning the weather.

ITEM I"tem, v. t. [imp. & p. p. Itemed; p. pr. & vb. n. Iteming.]

Defn: To make a note or memorandum of. I have itemed it in my memory. Addison.

ITEMIZE I"tem*ize, v. t.

Defn: To state in items, or by particulars; as, to itemize the cost of a railroad. [Local, U. S.]

ITER I"ter, n. Etym: [L. See Eyre.] (Anat.)

Defn: A passage; esp., the passage between the third and fourth ventricles in the brain; the aqueduct of Sylvius.

ITERABLE It"er*a*ble, a. Etym: [L. iterabilis. See Iterate.]

Defn: Capable of being iterated or repeated. [Obs.]

ITERANCE It"er*ance, n.

Defn: Iteration. [Obs.]

ITERANT It"er*ant, a. Etym: [L. iterans, p. pr. of iterare.]

Defn: Repeating; iterating; as, an iterant echo. Bacon.

ITERATE It"er*ate, a. Etym: [L. iteratus, p. p. of iterare to repeat, fr. iterum again, prop. a compar. from the stem of is he, that; cf. L. ita so, item likewise, also, Skr. itara other, iti thus. Cf. Identity, Item.]

Defn: Uttered or done again; repeated. [Obs.] Bp. Gardiner.

ITERATE It"er*ate, v. t. [imp. & p. p. Iterated; p. pr. & vb. n. Iterating.]

Defn: To utter or do a second time or many times; to repeat; as, to iterate advice. Nor Eve to iterate Her former trespass feared. Milton.

ITERATE It"er*ate, adv.

Defn: By way of iteration.

ITERATION It`er*a"tion, n. Etym: [L. iteratio.]

Defn: Recital or performance a second time; repetition. Bacon. What needs this iteration, woman Shak.

ITERATIVE It"er*a*tive, a. Etym: [L. iterativus: cf. F. itératif.]

Defn: Repeating. Cotgrave. -- It"er*a*tive*ly, adv.

ITHYPHALLIC Ith`y*phal"lic, a. Etym: [L. ithyphallicus, fr. ithyphallus, Gr. membrum virile erectum, or a figure thereof carried in the festivals of Bacchus.]

Defn: Lustful; lewd; salacious; indecent; obscene.

ITINERACY I*tin"er*a*cy, n.

Defn: The act or practice of itinerating; itinerancy.

ITINERANCY I*tin"er*an*cy, n. Etym: [See Itinerant.]

1. A passing from place to place. Dr. H. More.

2. A discharge of official duty involving frequent change of residence; the custom or practice of discharging official duty in this way; also, a body of persons who thus discharge official duty.

ITINERANT I*tin"er*ant, a. Etym: [LL. itinerans, -antis, p. pr. of itinerare to make a journey, fr. L. iter, itineris, a walk, way, journey. See Errant, Issue.]

Defn: Passing or traveling about a country; going or preaching on a circuit; wandering; not settled; as, an itinerant preacher; an itinerant peddler. The king's own courts were then itinerant, being kept in the king's palace, and removing with his household in those royal progresses which he continually made. Blackstone.

ITINERANT I*tin"er*ant, a.

Defn: One who travels from place to place, particularly a preacher; one who is unsettled. Glad to turn itinerant, To stroll and teach from town to town. Hudibras.

ITINERANTLY I*tin"er*ant*ly, adv.

Defn: In an itinerant manner.

ITINERARY I*tin"er*a*ry, a. Etym: [L. itinerarius: cf. F. itinéraire. See Itinerant.]

Defn: Itinerant; traveling; passing from place to place; done on a journey. It was rather an itinerary circuit of justice than a progress. Bacon.

ITINERARY I*tin"er*a*ry, n.; pl. Itineraries. Etym: [L. itinerarium: cf. F. itinéraire. See Itinerary, a.]

Defn: An account of travels, or a register of places and distances as a guide to travelers; as, the Itinerary of Antoninus.

ITINERATE I*tin"er*ate. v. i. [imp. & p. p. Itinerated; p. pr. & vb. n. Itinerating.] Etym: [LL. itineratus, p. p. of itinerari, itinerare. See Itinerant.]

Defn: To wander without a settled habitation; to travel from place or on a circuit, particularly for the purpose of preaching, lecturing, etc.

-ITIS -i"tis, Etym: [Gr.

Defn: A suffix used in medical terms to denote an inflammatory disease of; as, arthritis; bronchitis, phrenitis.

ITS Its.

Defn: Possessive form of the pronoun it. See It.

ITSELF It*self", pron.

Defn: The neuter reciprocal pronoun of It; as, the thing is good in itself; it stands by itself. Borrowing of foreigners, in itself, makes not the kingdom rich or poor. Locke.

ITTRIA It"tri*a, n. Etym: [NL.]

Defn: See Yttria.

ITTRIUM It"tri*um, n. Etym: [NL.]

Defn: See Yttrium.

ITZIBU It"zi*bu, n. Etym: [Jap. ichibu.] (Numis.)

Defn: A silver coin of Japan, worth about thirty-four cents. [Written also itzebu, ichebu, itcheboo, etc.]

IULIDAN I*u"li*dan, n. Etym: [See Iulus.] (Zoöl.)

Defn: One of the Iulidæ, a family of myriapods, of which the genus Iulus is the type. See Iulus.

IULUS I*u"lus, n. Etym: [L., down, Gr. (Zoöl.)

Defn: A genus of chilognathous myriapods. The body is long and round, consisting of numerous smooth, equal segments, each of which bears two pairs of short legs. It includes the galleyworms. See Chilognatha.

IVAN IVANOVITCH I*van" I*van"o*vitch

Defn: . An ideal personification of the typical Russian or of the Russian people; -- used as "John Bull" is used for the typical Englishman.

I'VE I've

Defn: . Colloquial contraction of I have.

-IVE -ive. Etym: [L. -ivus.]

Defn: An adjective suffix signifying relating or belonging to, of the nature of, tending to; as affirmative, active, conclusive, corrective, diminutive.

IVIED I"vied, a. Etym: [From Ivy.]

Defn: Overgrown with ivy.

IVORIDE I"vo*ride, n.

Defn: A composition resembling ivory in appearance and used as a substitute for it.

IVORY I"vo*ry, n.; pl. Ivories. Etym: [OE. ivori, F. ivoire, fr. L. eboreus made of ivory, fr. ebur, eboris, ivory, cf. Skr. ibha elephant. Cf. Eburnean.]

1. The hard, white, opaque, fine-grained substance constituting the tusks of the elephant. It is a variety of dentine, characterized by the minuteness and close arrangement of the tubes, as also by their double flexure. It is used in manufacturing articles of ornament or utility.

Note: Ivory is the name commercially given not only to the substance constituting the tusks of the elephant, but also to that of the tusks of the hippopotamus and walrus, the hornlike tusk of the narwhal, etc.

2. The tusks themselves of the elephant, etc.

3. Any carving executed in ivory. Mollett.

4. pl.

Defn: Teeth; as, to show one's ivories. [Slang] Ivory black. See under Black, n. -- Ivory gull (Zoöl.), a white Arctic gull (Larus eburneus). -- Ivory nut (Bot.), the nut of a species of palm, the Phytephas macroarpa, often as large as a hen's egg. When young the seed contains a fluid, which gradually hardness into a whitish, close- grained, albuminous substance, resembling the finest ivory in texture and color, whence it is called vegetable ivory. It is wrought into various articles, as buttons, chessmen, etc. The palm is found in New Grenada. A smaller kind is the fruit of the Phytephas microarpa. The nuts are known in commerce as Corosso nuts. -- Ivory palm (Bot.), the palm tree which produces ivory nuts. -- Ivory shell (Zoöl.), any species of Eburna, a genus of marine gastropod shells, having a smooth surface, usually white with red or brown spots. -- Vegetable ivory, the meat of the ivory nut. See Ivory nut (above).

IVORY-BILL I"vo*ry-bill`, n. (Zoöl.)

Defn: A large, handsome, North American woodpecker (Campephilus principalis), having a large, sharp, ivory-colored beak. Its general color is glossy black, with white secondaries, and a white dorsal stripe. The male has a large, scarlet crest. It is now rare, and found only in the Gulf States.

IVORYTYPE I"vo*ry*type`, n. (photog.)

Defn: A picture produced by superposing a very light print, rendered translucent by varnish, and tinted upon the back, upon a stronger print, so as to give the effect of a photograph in natural colors; -- called also hellenotype. Knight.

IVY I"vy, n.; pl. Ivies. Etym: [AS. ifig; akin to OHG. ebawi, ebah, G. epheu.] (Bot.)

Defn: A plant of the genus Hedera (H. helix), common in Europe. Its leaves are evergreen, dark, smooth, shining, and mostly five-pointed; the flowers yellowish and small; the berries black or yellow. The stem clings to walls and trees by rootlike fibers. Direct The clasping ivy where to climb. Milton. Ye myrtles brown, with ivy never sere. Milton. American ivy. (Bot.) See Virginia creeper. -- English ivy (Bot.), a popular name in America for the ivy proper (Hedera helix). -- German ivy (Bot.), a creeping plant, with smooth, succulent stems, and fleshy, light-green leaves; a species of Senecio (S. scandens). -- Ground ivy. (Bot.) Gill (Nepeta Glechoma). -- Ivy bush. (Bot.) See Mountain laurel, under Mountain. -- Ivy owl (Zoöl.), the barn owl. -- Ivy tod (Bot.), the ivy plant. Tennyson. -- Japanese ivy (Bot.), a climbing plant (Ampelopsis tricuspidata), closely related to the Virginia creeper. -- Poison ivy (Bot.), an American woody creeper (Rhus Toxicodendron), with trifoliate leaves, and greenish-white berries. It is exceedingly poisonous to the touch for most persons. -- To pipe in an ivy leaf, to console one's self as best one can. [Obs.] Chaucer. -- West Indian ivy, a climbing plant of the genus Marcgravia.

IVY-MANTLED I"vy-man`tled, a.

Defn: Covered with ivy.

IWIS I*wis", adv.

Defn: Indeed; truly. See Ywis. [Written also iwys, iwisse, etc.] [Obs.] Ascham.