The Collaborative International Dictionary of English v.0.48:

Platinichloric \Plat`i*ni*chlo"ric\, a. (Chem.)
   Of, pertaining to, or designating, an acid consisting of
   platinic chloride and hydrochloric acid, and obtained as a
   brownish red crystalline substance, called platinichloric, or
   chloroplatinic, acid.
   [1913 Webster]