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va·na·dic acid(və-nā′dĭk, -năd′ĭk)
An acid containing a vanadate group, especially HVO3, H3VO4, or H4V2O7, not existing in a pure state, but often used in its anhydride form, vanadium pentoxide.
(Elements & Compounds) any one of various oxyacids of vanadium, such as H3VO4 (orthovanadic acid), HVO4 (metavanadic acid), and H4V2O7 (pyrovanadic acid), known chiefly in the form of their vanadate salts
any of certain acids containing vanadium, esp. one having the formula H3VO4.