Isopiestic lines, lines showing, in a diagram, the relations of temperature and volume, when the elastic force is constant; — called also isobars.

(||I`so*pleu"ra) n. pl. [NL. See Iso-, and Pleura.] (Zoöl.) A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.

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

(I"so*pod) a. (Zoöl.) Having the legs similar in structure; belonging to the Isopoda.n. One of the Isopoda.

(||I*sop"o*da) n. pl. [NL. See Iso-, and -poda.] (Zoöl.) An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.

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.

(I`so*pod"i*form) a. [Isopod + -form.] (Zoöl.) Having the shape of an isopod; — said of the larvæ of certain insects.

(I*sop"o*dous) a. Same as Isopod.

(I`so*pog"o*nous) a. [Iso- + Gr. beard.] (Zoöl.) Having the two webs equal in breadth; — said of feathers.

(I"so*prene) n. [Etymol. uncertain.] (Chem.) An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or gutta-percha.

(I`so*pyc"nic) a. [Iso- + Gr. pykno`s dense.] (Physics) Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface.

(I`so*pyc"nic), n. (Physics) A line or surface passing through those points in a medium, at which the density is the same.

(I*sor"cin) n. [Iso- + orcin.] (Chem.) A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially; — called also cresorcin.

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

Isopepsin to Itacism

(I`so*pep"sin) n. [Iso- + pepsin.] (Physiol. Chem.) Pepsin modified by exposure to a temperature of from 40° to 60° C.

(I`so*per`i*met"ric*al) a. [Gr. equal + circumference: cf. F. isopérimètre. See Perimeter.] (Geom.) Having equal perimeters of circumferences; as, isoperimetrical figures or bodies.

(I`so*per*im"e*try) n. (Geom.) The science of figures having equal perimeters or boundaries.

(I`so*pi*es"tic) a. [Iso- + Gr. to press.] (Thermodynamics) Having equal pressure.

  By PanEris using Melati.

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