sodium phosphate
nounMedical Definition of sodium phosphate
1
: a phosphate NaH2PO4 of sodium containing one sodium atom per molecule that with the phosphate containing two sodium atoms per molecule constitutes the principal buffer system of the urine
— called also monobasic sodium phosphate, sodium acid phosphate, sodium dihydrogen phosphate
2
: a phosphate Na2HPO4 of sodium containing two sodium atoms per molecule that is used in medicine as a laxative and antacid
— called also dibasic sodium phosphate
3
: a phosphate Na3PO4 of sodium containing three sodium atoms per molecule that is used chiefly in cleaning compositions and in water treatment