Source : Webster's Revised Unabridged Dictionary (1913)

Contradistinguish \Con`tra*dis*tin"guish\ (?; 144), v. t. [imp.
   & p. p. {Contradistinguished}; p. pr. & vb. n.
   {Contradistinguishing}.]
   To distinguish by a contrast of opposite qualities.

         These are our complex ideas of soul and body, as
         contradistinguished.                     --Locke.

Source : WordNet®

contradistinguish
     v : distinguish by contrasting qualities