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

(Pyr`o*a*ce"tic) a. [Pyro- + acetic: cf. F. pyroacétique.] (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) 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

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