the GNU version of the Collaborative International Dictionary of English
n. A salt of pyrophosphoric acid.
The Century Dictionary and Cyclopedia
n. A salt of pyrophosphoric acid. See pyrophosphoric.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a salt or ester of pyrophosphoric acid
Word Usage
"Left off that image was a byproduct of this reaction: two linked phosphates (called a pyrophosphate), which are cleaved off as the sugar-phosphate-sugar bonding forms."