[pahy-roh-fos-fawr-ik, -for-, pahy-] /ˈpaɪ roʊ fɒsˈfɔr ɪk, -ˈfɒr-, ˌpaɪ-/

noun, Chemistry.
a crystalline, water-soluble powder, H 4 P 2 O 7 , formed by the union of one molecule of phosphorus pentoxide with two molecules of water.
a crystalline soluble solid acid formed by the reaction between one molecule of phosphorus pentoxide and two water molecules. Formula: H4P2O7 See also polyphosphoric acid

pyrophosphoric acid py·ro·phos·phor·ic acid (pī’rō-fŏs-fôr’ĭk)
A syrupy viscous liquid used as a catalyst, in organic chemical synthesis, and, in its salt forms, as medicines.
pyrophosphoric acid
A viscous liquid used as a catalyst and in the manufacture of organic chemicals. Chemical formula: H4P2O7.

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