pyrophosphoric acid: Meaning and Definition of

py'ro•phos•phor'ic ac'id

Pronunciation: (pī'rō-fos-fôr'ik, -for'-, pī"-), [key]
— Chem. Chem.
  1. a crystalline, water-soluble powder, HPO, formed by the union of one molecule of phosphorus pentoxide with two molecules of water.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.