from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A syrupy viscous liquid, H4P2O7, used as a catalyst and in organic chemical manufacture.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A syrupy liquid formed by the dehydration of phosphoric acid; its salts, the pyrophosphates, are used in medicine.
- n. The acid formed by removing a molecule of water from two molecules of phosphoric acid, H4P2O7; this reaction slowly reverses in the presence of water.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a solid acid formed by reactions of orthophosphoric acid
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