Part 403

Milton.

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

Isle, v. t. To cause to become an island, or like an island; to surround or encompass; to island. [Poetic]

Isled in sudden seas of light.

Tennyson.

Is"let (?), n. [OF. islette (cf. F. îlot), dim. of isle.] A little island.

-ism (?). [F. -isme, or L. -ismus, Gr. &?;.] 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, n. [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.

{ Is`ma*e"li*an (?), Is"ma*el*ite (?), } n. (Eccl.) One of a sect of Mohammedans who favored the pretensions of the family of Mohammed ben Ismael, of the house of Ali.

{ I"so- (?), Is- (?). } [Gr. 'i`sos equal.] 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.

I"so*bar (?), n. [Iso- + Gr. &?; weight.] (Phys. Geog.) 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.]

I`so*bar"ic (?), a. (Phys. Geog.) Denoting equal pressure; as, an isobaric line; specifically, of or pertaining to isobars.

I"so*bar*ism (?), n. The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science.

I`so*bar`o*met"ric (?), a. [Iso + barometric.] (Phys. Geog.) Indicating equal barometric pressure.

I`so*bath"y*therm (?), n. [Iso- + Gr. &?; deep + &?; heat.] (Phys. Geog.) A line connecting the points on the surface of the earth where a certain temperature is found at the same depth.

I`so*bath"y*ther"mic (?), a. Of or pertaining to an isobathytherm; possessing or indicating the same temperature at the same depth.

I`so*ceph"a*lism (?), n. [From Gr. &?; 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.

I"so*chasm (?), n. [Iso- + chasm.] (Phys. Geog.) A line connecting places on the earth's surface at which there is the same mean frequency of auroras.

I`so*chas"mic (?), a. Indicating equal auroral display; as, an isochasmic line.

I"so*cheim ("s*km), n. [Iso- + Gr. &?;, &?;, winter.] (Phys. Geog.) A line connecting places on the earth having the same mean winter temperature. Cf. Isothere.

{ I`so*chei"mal, I`so*chi"mal } (?), a. Pertaining to, having the nature of, or making, isocheims; as, an isocheimal line; an isocheimal chart.

{ I`so*chei"me*nal (?), I`so*chi"me*nal } a. The same as Isocheimal.

I`so*chei"mic (?), a. The same as Isocheimal.

I`so*chi"mene (?), n. The same as Isocheim.

I`so*chro*mat"ic (?), a. [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.

I*soch"ro*nal (?), a. [See Isochronous.] Uniform in time; of equal time; performed in equal times; recurring at regular intervals; as, isochronal vibrations or oscillations.