An acid in which the number of hydroxyl groups equals the valence of the acid-forming element; e.g., C(OH)4, orthocarbonic acid. When there is no such acid, the one that most nearly approaches this condition is sometimes called an o.; e.g., OP(OH)3, orthophosphoric acid.

Medical dictionary. 2011.

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  • orthoacid — noun the member of a series of oxyacids of a particular element that has the highest number of hydroxyl groups …   Wiktionary

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