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
vanadic acid in American English
any of a series of acids containing vanadium that apparently do not exist in the free state but are represented in various vanadates