Hyperchloric \Hy`per*chlo"ric\, a. (Chem.) See {Perchloric}. [1913 Webster]
Perchloric \Per*chlo"ric\, a. [Pref. per- + chloric.] (Chem.) Pertaining to, or designating, the highest oxygen acid ({HClO4}), of chlorine; -- called also {hyperchloric}. [1913 Webster]