Source : Webster's Revised Unabridged Dictionary (1913)

Oxychloric \Ox`y*chlo"ric\, a. [Oxy
   (a) + chloric.] (Chem.)
   (a) Of, pertaining to, or designating in general, certain
       compounds containing oxygen and chlorine.
   (b) Formerly designating an acid now called {perchloric
       acid}. See {Perchloric}.

Source : WordNet®

perchloric acid
     n : a powerful oxidizing agent; forms perchlorates