: a phosphate of ammonium made by reaction of ammonia and phosphoric acid: as
a. : the white crystalline primary phosphate NH4H2PO4 or sometimes a commercial mixture of this with ammonium sulfate, used chiefly as a fertilizer and as a fire retardant — called also ammonium dihydrogen phosphate, monoammonium phosphate, monobasic ammonium phosphate
b. : the white crystalline secondary phosphate (NH4)2HPO4 similarly used — called also diammonium phosphate, dibasic ammonium phosphate
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Chem.
1. See monoammonium phosphate.
2. (loosely) diammonium phosphate.
Useful english dictionary. 2012.