Isentropic adjective [ Is- + entropy + -ic .] (Physics) Having equal entropy.

Isentropic lines , lines which pass through points having equal entropy.

Isethionic adjective [ Is- + ethionic .] (Chemistry) Pertaining to, derived from, or designating, an acid, HO.C ₂ H ₄ .SO ₃ H, obtained as an oily or crystalline substance, by the action of sulphur trioxide on alcohol or ether. It is derivative of sulphuric acid.

Ishmaelite noun
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 adjective Of, pertaining to, or resembling, an Ishmaelite or the Ishmaelites.

Isiac adjective [ Latin Isiacus , Greek ..., from ....] Pertaining to the goddess Isis; as, Isiac mysteries.

Isicle noun A icicle. [ Obsolete]

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

Isinglass noun [ Prob. corrupted from Dutch huizenblas (akin to German hausenblase ), lit., bladder of the huso, or large sturgeon; huizen sturgeon + blas bladder. Confer Bladder , Blast a gust of wind.]

1. A semitransparent, whitish, and very pure form of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso ) found in the rivers 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.) A popular name for mica, especially when in thin sheets.

Isis noun [ Latin , the goddess Isis, from Greek ....]

1. (Myth.) 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. (Zoology) 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.) One of the asteroids.

Islam noun [ Arabic islām obedience to the will of God, submission, humbling one's self, resigning one's self to the divine disposal. Confer 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 noun [ Confer French islamisme .] The faith, doctrines, or religious system of the Mohammedans; Mohammedanism; Islam.

Islamite noun A Mohammedan.

Islamitic adjective Of or pertaining to Islam; Mohammedan.

Islamize intransitive verb & t. [ imperfect & past participle Islamized ; present participle & verbal noun Islamizing .] To conform, or cause to conform, to the religion of Islam.

Island noun [ Middle English iland , yland , Anglo-Saxon īgland , ...gland , ...glond ; īg , ...g , island + land , lond , land. Anglo-Saxon īg , ...g , is akin to Anglo-Saxon eá water, river, Old High German ...uwa , German au meadow, Icelandic ey island, Dan. & Swedish ö , Goth. ahwa a stream, water, Latin aqua water. The s is due to confusion with isle . Confer Ait , Eyot , Ewer , Aquatic .]

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

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

3. (Zoology) See Isle , noun , 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 transitive verb
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 noun An inhabitant of an island.

Islandy adjective Of or pertaining to islands; full of islands. Cotgrave.

Isle noun [ Obs .] See Aisle .

Isle noun [ Old French isle , French île , Latin insula ; confer Lithuanian sala . Confer Insulate .]

1. An island. [ Poetic]

Imperial rule of all the seagirt isles .

Milton.

2. (Zoology) A spot within another of a different color, as upon the wings of some insects.

Isle transitive verb 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 noun [ Old French islette (cf. French îlot ), dim. of isle .] A little island.

Ism noun [ See ism , above.] 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 noun (Eccl.) One of a sect of Mohammedans who favored the pretensions of the family of Mohammed ben Ismael, of the house of Ali.

Iso-, Is- [ Greek 'i`sos equal.] A prefix or combining form, indicating identity , or equality ; the same numerical value ; as in iso pod, iso morphous, iso chromatic. Specif.: (a) (Chemistry) Applied to certain compounds having the same composition but different properties; as in iso cyanic. (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 iso paraffine; iso pentane.

Isobar noun [ Iso- + Greek ... weight.] (Physics Geology) 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 .]

Isobaric adjective (Physics Geology) Denoting equal pressure; as, an isobaric line; specifically, of or pertaining to isobars.

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

Isobarometric adjective [ Iso + barometric .] (Physics Geology) Indicating equal barometric pressure.

Isobathytherm noun [ Iso- + Greek ... deep + ... heat.] (Physics Geology) A line connecting the points on the surface of the earth where a certain temperature is found at the same depth.

Isobathythermic adjective Of or pertaining to an isobathytherm; possessing or indicating the same temperature at the same depth.

Isobront (ī"so*brŏnt) noun [ Iso- + Greek bronth` thunder.] (Meteor.) 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 noun [ From Greek ... like-headed. See Iso- , and Cephalon .] (Art) 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 noun [ Iso- + chasm .] (Physics Geology) A line connecting places on the earth's surface at which there is the same mean frequency of auroras.

Isochasmic adjective Indicating equal auroral display; as, an isochasmic line.

Isocheim (ī"so*kīm) noun [ Iso- + Greek ..., ..., winter.] (Physics Geology) A line connecting places on the earth having the same mean winter temperature. Confer Isothere .

Isocheimal, Isochimal adjective Pertaining to, having the nature of, or making, isocheims; as, an isocheimal line; an isocheimal chart.

Isocheimenal, Isochimenal adjective The same as Isocheimal .

Isocheimic adjective The same as Isocheimal .

Isochimene noun The same as Isocheim .

Isochor noun [ Iso- + Greek xhw`ra space.] (Physics) 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 adjective

Isochromatic adjective [ Iso- + chromatic .] (Opt.) 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 adjective [ See Isochronous .] Uniform in time; of equal time; performed in equal times; recurring at regular intervals; as, isochronal vibrations or oscillations.

Isochronic adjective Isochronal.

Isochronism noun The state or quality of being isochronous.

Isochronize transitive verb [ imperfect & past participle -nized ; present participle & verbal noun -nizing .] [ See Isochronous .] To make, or tend to make (the motion of a moving body), uniform in rate of rotation, or in frequency of vibration.

Isochronon noun [ New Latin See Isochronous .] A clock that is designed to keep very accurate time.

Isochronous adjective [ Greek ...; ... equal + ... time.] Same as Isochronal .

Isochroous adjective [ Iso- + Greek ... color.] Having the same tint or color throughout; uniformly or evenly colored.

Isoclinal, Isoclinic adjective [ Iso- + Greek ... to incline.] 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.