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From The Collaborative International Dictionary of English v.0.48:
Vanadic \Va*nad"ic\, a. (Chem.) Pertaining to, or obtained from, vanadium; containing vanadium; specifically, designating those compounds in which vanadium has a relatively higher valence as contrasted with the vanadous compounds; as, vanadic oxide. [1913 Webster] Vanadic acid (Chem.), an acid analogous to phosphoric acid, not known in the free state but forming a well-known series of salts. [1913 Webster]