| pyrophosphoric | <chemistry> Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates. Origin: Pyro- + phosphoric. Source: Websters Dictionary (01 Mar 1998) |
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| pyrophosphoric acid | H4P2O7;an anhydride of phosphoric acid obtained by heating phosphoric acid to 213캜; it forms pyrophosphates with bases, and its esters are important in energy metabolism and in biosynthesis. (05 Mar 2000) |