sodium metaphosphate

noun

Definition of sodium metaphosphate

1 : any of several crystalline sodium salts NaPO₃ or (NaPO₃)_n of a metaphosphoric acid: such as

a : the water-soluble cyclic trimetaphosphate (NaPO₃)₃ or NaPO₃ I

b : sodium Kurrol's salt NaPO₃ IV

2a : a water-soluble sodium phosphate glass having the composition of a sodium metaphosphate

— called also sodium (1:1) phosphate

— compare sodium hexametaphosphate

b : sodium phosphate glass