A salt of pyrophosphoric acid; accumulates in cases of hypophosphatasia; sometimes referred to as inorganic p. (PPi). SYN: diphosphate.

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py·ro·phos·phate -'fäs-.fāt n a salt or ester of pyrophosphoric acid

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py·ro·phos·phate (pi″ro-fosґfāt) any salt, anion, or ester of pyrophosphoric acid. Formed during many metabolic reactions, it is an important intermediate because its large free energy of hydrolysis makes the reactions essentially irreversible. The symbol PPi denotes the uncombined form.

Medical dictionary. 2011.

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  • Pyrophosphate — Pyr o*phos phate, n. (Chem.) A salt of pyrophosphoric acid. [1913 Webster] …   The Collaborative International Dictionary of English

  • pyrophosphate — [pī΄rə fäs′fāt΄] n. a salt or ester of pyrophosphoric acid …   English World dictionary

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  • pyrophosphate — noun a salt or ester of pyrophosphoric acid • Hypernyms: ↑salt * * * /puy reuh fos fayt/, n. Chem. a salt or ester of pyrophosphoric acid. [1830 40; PYROPHOSPH(ORIC ACID) + ATE2] * * * pyrophosphate noun see above • • • Main Entry: ↑pyro …   Useful english dictionary

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