An acid in which the number of hydroxyl groups equals the valence of the acid-forming element, for example, C(OH)4, orthocarbonic acid. When no such acid is present, the one that most nearly approaches this condition is sometimes called an orthoacid, for example, OP(OH)3, orthophosphoric acid.
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An acid with as many hydroxyl groups as the number of valences of the acid-forming portion of the molecule.
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