'Vanadic acid' definitions:

Definition of 'vanadic acid'

noun

Any of various oxyacids of vanadium; known mostly in the form of its salts [syn: vanadium pentoxide, vanadic acid]

From: GCIDE

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]