noun
a sodium salt of pyrophosphoric acid used as a builder in soaps and detergents
• Syn: ↑tetrasodium pyrophosphate
• Hypernyms: ↑builder, ↑detergent builder
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noun : any of four sodium salts of pyrophosphoric acid: as
a. : a crystalline acid salt Na2H2P2O7 used chiefly as a leavening agent, in acid cleaning compositions, and in electroplating; disodium dihydrogen pyrophosphate — called also sodium acid pyrophosphate
b. : the crystalline normal salt Na4P2O7 used chiefly as a builder in soaps and detergents and as a deflocculant (as in treating drilling muds for oil wells) — called also tetrasodium pyrophosphate
Useful english dictionary. 2012.