Webster's Dictionary, 1913

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Pyrope noun [ Latin pyropus a kind of red bronze, from Greek ...; ... fire + ... the eye, face: confer French pyrope .] (Min.) A variety of garnet, of a poppy or blood-red color, frequently with a tinge of orange. It is used as a gem. See the Note under Garnet .

Pyrophane noun [ See Pyrophanous .] (Min.) A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat.

Pyrophanous adjective [ Pyro- + Greek ... to show, pass, to shine.] Rendered transparent by heat.

Pyrophone noun [ Pyro- + Greek ... sound.] A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths.

Pyrophoric, Pyrophorous adjective [ Pyro- + Greek ... to bear.] Light- producing; of or pertaining to pyrophorus.

Pyrophoric iron (Chemistry) , finely reduced iron, which ignites spontaneously on contact with air.

Pyrophorus noun [ New Latin See Pyrophorous .] (Old Chem.) Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.

Pyrophosphate noun (Chemistry) A salt of pyrophosphoric acid.

Pyrophosphoric adjective [ Pyro- + phosphoric .] (Chemistry) Pertaining to, or designating, an acid, H 4 P 2 O 7 , which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

Pyrophyllite noun [ Pyro- + Greek ... leaf.] (Min.) A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.

Pyroscope noun [ Pyro- + - scope : confer French pyroscope .] (Physics) An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf. [ R.]

Pyrosis noun [ New Latin , fr Greek ... a burning, an inflammation, from ... to burn, from ... fire.] (Medicine) See Water brash , under Brash .

Pyrosmalite noun [ Pyro- + Greek ... odor + -like . ] (Min.) A mineral, usually of a pale brown or of a gray or grayish green color, consisting chiefly of the hydrous silicate of iron and manganese; -- so called from the odor given off before the blowpipe.

Pyrosome noun [ Pyro- + - some body.] (Zoology) Any compound ascidian of the genus Pyrosoma . The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.

Pyrosulphate noun (Chemistry) A salt of pyrosulphuric acid.

Pyrosulphuric adjective [ Pyro- + -sulphuric .] (Chemistry) Pertaining to, or designating, an acid called also disulphuric acid ) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, H 2 S 2 O 7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.

Pyrotartaric adjective [ Pyro- + tartaric .] (Chemistry) Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid.

Pyrotartrate noun (Chemistry) A salt of pyrotartaric acid.

Pyrotechnian noun A pyrotechnist.

Pyrotechnic, Pyrotechnical adjective [ Pyro- + technic , technical: confer French pyrotechnique . See Fire , Technical .] Of or pertaining to fireworks, or the art of forming them.

Pyrotechnical sponge . See under Sponge .

Pyrotechnician noun A pyrotechnist.

Pyrotechnics noun The art of making fireworks; the manufacture and use of fireworks; pyrotechny.

Pyrotechnist noun One skilled in pyrotechny; one who manufactures fireworks. Steevens.

Pyrotechny noun [ Confer French pyrotechnie .]
1. The use and application of fire in science and the arts. [ Obsolete] Sir M. Hale.

2. Same as Pyrotechnics .

Pyrothonide noun [ Pyro- + Greek ... linen.] (Medicine) A kind of empyreumatic oil produced by the combustion of textures of hemp, linen, or cotton in a copper vessel, -- formerly used as a remedial agent. Dunglison.

Pyrotic adjective [ Greek ..., from ... to burn, from ..., ..., fire: confer French pyrotique .] Caustic. See Caustic . -- noun (Medicine) A caustic medicine.

Pyrotritartaric adjective [ Pyro- + tri- + tartaric .] (Chemistry) Designating an acid which is more commonly called uric acid.

Pyrotungstic adjective (Chemistry) Polytungstic. See Metatungstic .

Pyrovanadic adjective [ Pyro- + vanadic .] (Chemistry) Pertaining to, or designating, an acid of vanadium, analogous to pyrophosphoric acid.

Pyroxanthin noun [ Pyro- + Greek ... yellow.] (Chemistry) A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin .

Pyroxene noun [ French pyroxène , from Greek ... 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.

Pyroxenic adjective [ Confer French pyroxénique .] Containing pyroxene; composed chiefly of pyroxene.

Pyroxenite noun (Min.) A rock consisting essentially of pyroxene.

Pyroxyle noun [ Confer French pyroxyle . See Pyroxylic , -yl .]

Pyroxylic adjective [ Pyro- + Greek ... wood.] (Old Chem.) Derived from wood by distillation; -- formerly used in designating crude wood spirit.

Pyroxylin noun (Chemistry) 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 .

Pyroüric adjective [ Pyro- + uric .] (Old Chem.) Pertaining to, or designating, an acid now called cyanuric acid. See Cyanuric .

Pyrrhic adjective [ Latin pyrrhichius , Greek ... 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.

Pyrrhic noun
1. [ Greek ...: confer French pyrrhique , fem.] An ancient Greek martial dance, to the accompaniment of the flute, its time being very quick.

2. [ Latin pyrrhichius (sc. pes ), Greek ... (sc. ...): confer French pyrrhique , masc.] (Pros.) A foot consisting of two short syllables.

Pyrrhicist noun (Gr. Antiq.) One two danced the pyrrhic.

Pyrrhonean, Pyrrhonic adjective [ Latin Pyrrhonêus : confer French pyrrhonien .] Of or pertaining to pyrrhonism.

Pyrrhonism noun [ From Pyrrho , the founder of a school of skeptics in Greece (about 300 b. c. ): confer French pyrrhonisme .] Skepticism; universal doubt.

Pyrrhonist noun A follower of Pyrrho; a skeptic.

Pyrrhotine, Pyrrhotite noun [ Greek ... flame-colored, from ... 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 .

Pyrrol noun [ Greek ... flame-colored (from ... fire) + Latin ol eum oil.] (Chemistry) A nitrogenous base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, C 4 H 5 N, 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 .

Pyrroline noun (Chemistry) A nitrogenous base, C 4 H 7 N, obtained as a colorless liquid by the reduction of pyrrol.

Pyrula noun [ New Latin , from Latin pyrus a pear.] (Zoology) A genus of large marine gastropods. having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

Pyruric adjective Same as Pyroüric .

Pyrus noun [ Latin pyrus , or better pirus , pear tree.] (Botany) A genus of rosaceous trees and shrubs having pomes for fruit. It includes the apple, crab apple, pear, chokeberry, sorb, and mountain ash.

Pyruvic adjective [ Pyro- + Latin uva a grape.] (Chemistry) Pertaining to, or designating, an acid (called also pyroracemic acid ) obtained, as a liquid having a pungent odor, by the distillation of racemic acid.

Pyruvil noun (Chemistry) A complex nitrogenous compound obtained by heating together pyruvic acid and urea.