'Pyrophosphate' definitions:

Definition of 'pyrophosphate'

(from WordNet)
noun
A salt or ester of pyrophosphoric acid

Definition of 'Pyrophosphate'

From: GCIDE
  • Pyrophosphate \Pyr"o*phos"phate\, n. (Chem.) A salt of pyrophosphoric acid. [1913 Webster]