| pyro- | 1. <prefix> A combining form denoting fire, heat, or fever. See: pyr-, pyreto-. 2. In chemistry, combining form denoting derivatives formed by removal of water (usually by heat) to form anhydrides. Abbreviation of pyrogallic acid. See: anhydro-. Origin: G. Pyr, fire (21 Jun 2000) |
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| pyroacetic | <chemistry> Pertaining to, and designating, a substance (acetone) obtained by the distillation of the acetates. It is now Synonym: pyroacetic ether, and formerly was called pyroacetic spirit. Origin: Pyro- + acetic: cf. F. Pyroacetique. Source: Websters Dictionary (01 Mar 1998) |
| pyroacid | <chemistry> An acid obtained by sybjecting another acid to the action of heat. Cf. Pyro-. Origin: Pyro- + acid. Source: Websters Dictionary (01 Mar 1998) |
| pyroantimonate | <chemistry> A salt of pyroantimonic acid. Source: Websters Dictionary (01 Mar 1998) |
| pyroantimonic | <chemistry> Pertaining to, or designating, an acid of antimony analogous to pyrophosphoric acid. Origin: Pyro- + antimonic. Source: Websters Dictionary (01 Mar 1998) |
| pyroarsenate | <chemistry> A salt of pyroarsenic acid. Source: Websters Dictionary (01 Mar 1998) |
| pyroarsenic | <chemistry> Pertaining to or designating, an acid of arsenic analogous to pyrophosphoric acid. Origin: Pyro- + arsenic. Source: Websters Dictionary (01 Mar 1998) |
| pyroborate | <chemistry> A salt of pyroboric acid. Source: Websters Dictionary (01 Mar 1998) |
| pyroboric | <chemistry> 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. Origin: Pyro- + boric. Source: Websters Dictionary (01 Mar 1998) |
| pyroboric acid | Perboric or pyroboric acid. Synonym: pyroboric acid. (05 Mar 2000) |
| pyrocalciferol | 10a-Ergosta-5,7,22-trien-3b-ol; 9-alpha-lumisterol;a thermal decomposition product of calciferol. (05 Mar 2000) |
| pyrocatechase | <enzyme> Little activity towards chlorinated substrates Registry number: EC 1.13.11.1 Synonym: pyrocatechase, catechol-1,2-oxygenase, pyrocatechol 1,2-dioxygenase (26 Jun 1999) |
| pyrocatechin | <chemistry> 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. Synonym: catechol, oxyphenol. Etc. Origin: Pyro- + catechu. Source: Websters Dictionary (01 Mar 1998) |
| pyrocatechol | 1,2-benzenediol;a constituent of the catecholamines, epinephrine and norepinephrine, and dopa; used externally as an antiseptic. Synonym: catechol, pyrocatechin. (05 Mar 2000) |
| pyrochlore | <chemical> A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish colour and resinous luster; so called from its becoming grass-green on being subjected to heat under the blowpipe. Origin: Pyro- + Gr. Pale green. Source: Websters Dictionary (01 Mar 1998) |