PYROCATECHIN
Pyr`o*cat"e*chin, n. Etym: [Pyro- + catechu.] (Chem.)
Defn: 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.
PYROCHLORE
Pyr"o*chlore, n. Etym: [Pyro- + Gr. (Min.)
Defn: 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.
PYROCITRIC
Pyr`o*cit"ric, a. Etym: [Pyro- + citric: cf. F. pyrocitrique.]
(Chem.)
Defn: Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic, itaconic, and mesaconic acid.
PYROCOLL
Pyr"o*coll, n. Etym: [Puro- + Gr. (Chem.)
Defn: A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.
PYROELECTRIC
Pyr`o*e*lec"tric, a. Etym: [Pyro- + electric.] (Physics)
Defn: Pertaining to, or dependent on, pyroelectricity; receiving electric polarity when heated.