'HPO3' definitions:

Definition of 'HPO3'

From: GCIDE

metaphosphoric \met`a*phos*phor"ic\, a. [Pref. meta- + phosphoric.] (Chem.) 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}. [1913 Webster +PJC]