Source : Webster's Revised Unabridged Dictionary (1913)

Vanadic \Va*nad"ic\, a. (Chem.)
   Pertaining to, or obtained from, vanadium; containing
   vanadium; specifically distinguished those compounds in which
   vanadium has a relatively higher valence as contrasted with
   the {vanadious} compounds; as, vanadic oxide.

   {Vanadic acid} (Chem.), an acid analogous to phosphoric acid,
      not known in the free state but forming a well-known
      series of salts.