sodium phosphate

noun

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