Dictionary![]() ![]() met'a•phos•phor'ic ac'idPronunciation: (met"u-fos-fôr'ik, -for'-), [key] Chem. an acid, HPO3, derived from phosphorous pentoxide, and containing the smallest amount of water of the phosphoric acids. Cf. phosphoric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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