Part 699

Pyr"i*tous (?), a. Pyritic.

{ Pyro-, Pyr- }. [Gr. &?;, &?;, fire.] Combining forms designating fire or heat; specifically (Chem.), used to imply an actual or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc.

Py"ro (?), n. (Photog.) Abbreviation of pyrogallic acid. [Colloq.]

Pyr`o*a*ce"tic (?), a. [Pyro- + acetic: cf. F. pyroacÈtique.] (Chem.) Pertaining to, and designating, a substance (acetone) obtained by the distillation of the acetates. It is now called also pyroacetic ether, and formerly was called pyroacetic spirit.

Pyr`o*ac"id (?), n. [Pyro- + acid.] (Chem.) An acid obtained by sybjecting another acid to the action of heat. Cf. Pyro-.

Pyr`o*an`ti*mo"nate (?), n. (Chem.) A salt of pyroantimonic acid.

Pyr`o*an`ti*mon"ic (?), a. [Pyro- + antimonic.] (Chem.) Pertaining to, or designating, an acid of antimony analogous to pyrophosphoric acid.

Pyr`o*ar"se*nate (?), n. (Chem.) A salt of pyroarsenic acid.

Pyr`o*ar*sen"ic (?), a. [Pyro- + arsenic.] (Chem.) Pertaining to or designating, an acid of arsenic analogous to pyrophosphoric acid.

Pyr`o*bo"rate (?), n. (Chem.) A salt of pyroboric acid.

Pyr`o*bo"ric (?), a. [Pyro- + boric.] (Chem.) Pertaining to derived from, or designating, an acid, H2B4O7 (called also tetraboric acid), which is the acid ingredient of ordinary borax, and is obtained by heating boric acid.

Pyr`o*cat"e*chin (?), n. [Pyro- + catechu.] (Chem.) A white crystalline substance, C6H4(OH)2, of the phenol series, found in various plants; -- so called because first obtained by distillation of gum catechu. Called also catechol, oxyphenol. etc.

Pyr"o*chlore (?), n. [Pyro- + Gr. &?; pale green.] (Min.) A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.

Pyr`o*cit"ric (?), a. [Pyro- + citric: cf. F. pyrocitrique.] (Chem.) Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic, itaconic, and mesaconic acid.

Pyr"o*coll (pr"*kl), n. [Puro- + Gr. ko`lla glue.] (Chem.) A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.

Pyr`o*e*lec"tric (?), a. [Pyro- + electric.] (Physics) Pertaining to, or dependent on, pyroelectricity; receiving electric polarity when heated.

Pyr`o*e*lec"tric, n. (Physics) A substance which becomes electrically polar when heated, exhibiting opposite charges of statical electricity at two separate parts, especially the two extremities.

Pyr`o*e`lec*tric"i*ty (?), n. (Physics) Electricity developed by means of heat; the science which treats of electricity thus developed.

Pyr`o*gal"late (?), n. (Chem.) A salt of pyrogallic acid; an ether of pyrogallol.

Pyr`o*gal"lic (?), a. [Pyro- + gallic.] (Chem.) Pertaining to, derived from, or designating, an acid called pyrogallol. See Pyrogallol.

Pyr`o*gal"lol (?), n. [Pyrogallic + -ol.] (Chem.) A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.

Pyr"o*gen (?), n. [See Pyrogenous.] 1. Electricity. [R.]

2. (Physiol. Chem.) A poison separable from decomposed meat infusions, and supposed to be formed from albuminous matter through the agency of bacteria.

Pyr`o*gen"ic (?), a. [Pyro- + -gen + -ic.] (Physiol.) Producing heat; -- said of substances, as septic poisons, which elevate the temperature of the body and cause fever.

Py*rog"e*nous (?), a. [Gr. &?; fire + genous: cf. F. purogËne, Gr. &?;.] Produced by fire; igneous. Mantell. .

Pyr`og*nos"tic (?), a. [Pyro- + Gr. &?; to know.] (Min.) Of or pertaining to characters developed by the use of heat; pertaining to the characters of minerals when examined before the blowpipe; as, the pyrognostic characters of galena.

Pyr`og*nos"tics (?), n. pl. (Min.) The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.

Py*rog"ra*phy (?), n. [Pyro- + -graphy.] A process of printing, ornamenting, or carving, by burning with heated instruments.