D defs.my
Entry 1 sense Webster, 1913

metaphosphoric

· met·a·phos·phor·ic · IPA
01 a. Pertaining to, or designating, a monobasic acid, HPO3, analogous to nitric acid, and, by heating phosphoric acid, obtained as a crystalline…
  1. 1.
    Pertaining to, or designating, a monobasic acid, HPO3, analogous to nitric acid, and, by heating phosphoric acid, obtained as a crystalline substance, commonly called glacial phosphoric acid. Compare the tribasic orthophosphoric acid.(Chem.) Also: glacial phosphoric acid