Definition of pyrophosphoric acid in US English:

pyrophosphoric acid

noun

Chemistry
  • A glassy solid obtained by heating phosphoric acid.

    A tetrabasic acid; chemical formula: H₄P₂O₇

    • ‘Pyrophosphoric acid is colorless, odorless, hygroscopic and is soluble in water.’

Pronunciation

pyrophosphoric acid

/-ˈfäsfərik/