Part 702

Pyr`o*¸"ric (?), a. [Pyro- + uric.] (Old Chem.) Pertaining to, or designating, an acid now called cyanuric acid. See Cyanuric.

Pyr`o*va*nad"ic (?), a. [Pyro- + vanadic.] (Chem.) Pertaining to, or designating, an acid of vanadium, analogous to pyrophosphoric acid.

Pyr`o*xan"thin (?), n. [Pyro- + Gr. &?; yellow.] (Chem.) A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin.

Pyr"ox*ene (?), n. [F. pyroxËne, from Gr. &?; fire + &?; a stranger; -- so called because it was supposed to the be a stranger, or of rare occurrence, in igneous rocks,] (Min.) A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90∞, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.

The pyroxene group contains pyroxene proper, also the related orthorhombic species, enstatite, bronzite, hypersthene, and various monoclinic and triclinic species, as rhodonite, etc.

Pyr`ox*en"ic (?), a. [Cf. F. pyroxÈnique.] Containing pyroxene; composed chiefly of pyroxene.

Py*rox"e*nite (?), n. (Min.) A rock consisting essentially of pyroxene.

Py*rox"yle (?), n. [Cf. F. pyroxyle. See Pyroxylic, -yl.]

Pyr`ox*yl"ic (?), a. [Pyro- + Gr. &?; wood.] (Old Chem.) Derived from wood by distillation; -- formerly used in designating crude wood spirit.

Py*rox"y*lin (?), n. (Chem.) A substance resembling gun cotton in composition and properties, but distinct in that it is more highly nitrified and is soluble in alcohol, ether, etc.; -- called also pyroxyle.

Pyr"rhic (?), a. [L. pyrrhichius, Gr. &?; belonging to the &?; (sc. &?;) a kind of war dance.] 1. Of or pertaining to an ancient Greek martial dance. " ye have the pyrrhic dance as yet." Byron.

2. (Pros.) Of or pertaining to a pyrrhic, or to pyrrhics; containing pyrrhic; as, a pyrrhic verse.

Pyr"rhic, n. 1. [Gr. &?;: cf. F. pyrrhique, fem.] An ancient Greek martial dance, to the accompaniment of the flute, its time being very quick.

2. [L. pyrrhichius (sc. pes), Gr. &?; (sc. &?;): cf. F. pyrrhique, masc.] (Pros.) A foot consisting of two short syllables.

Pyr"rhi*cist (?), n. (Gr. Antiq.) One two danced the pyrrhic.

{ Pyr*rho"ne*an (?), Pyr*rhon"ic (?), } a. [L. PyrrhonÍus: cf. F. pyrrhonien.] Of or pertaining to pyrrhonism.

Pyr"rho*nism (?), n. [From Pyrrho, the founder of a school of skeptics in Greece (about 300 b. c.): cf. F. pyrrhonisme.] Skepticism; universal doubt.

Pyr"rho*nist (?), n. A follower of Pyrrho; a skeptic.

{ Pyr"rho*tine (?), Pyr"rho*tite (?), } n. [Gr. &?; flame-colored, fr. &?; fire.] (Min.) A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites.

Pyr"rol (?), n. [Gr. &?; flame-colored (from &?; fire) + L. oleum oil.] (Chem.) A nitrogenous base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, C4H5N, having on odor like that of chloroform. It is the nucleus and origin of a large number of derivatives. So called because it colors a splinter of wood moistened with hydrochloric acid a deep red.

Pyr"ro*line (?), n. (Chem.) A nitrogenous base, C4H7N, obtained as a colorless liquid by the reduction of pyrrol.

||Pyr"u*la (?), n. [NL., fr. L. pyrus a pear.] (Zoˆl.) A genus of large ||marine gastropods. having a pear-shaped shell. It includes the ||fig-shells. See Illust. in Appendix.

Py*ru"ric (?), a. Same as Pyro¸ric.

||Py"rus (?), n. [L. pyrus, or better pirus, pear tree.] (Bot.) A genus ||of rosaceous trees and shrubs having pomes for fruit. It includes the ||apple, crab apple, pear, chokeberry, sorb, and mountain ash.

Py*ru"vic (?), a. [Pyro- + L. uva a grape.] (Chem.) Pertaining to, or designating, an acid (called also pyroracemic acid) obtained, as a liquid having a pungent odor, by the distillation of racemic acid.

Py*ru"vil (?), n. (Chem.) A complex nitrogenous compound obtained by heating together pyruvic acid and urea.

Pyth`a*go"re*an (?), a. [L. Pythagoreus, Gr. &?;.] Of or pertaining to Pythagoras (a Greek philosopher, born about 582 b. c.), or his philosophy.

The central thought of the Pythagorean philosophy is the idea of number, the recognition of the numerical and mathematical relations of things.