contradistinguish

from WordNet (r) 3.0 (2006)

contradistinguish
    v 1: distinguish by contrasting qualities

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]

         These are our complex ideas of soul and body, as
         contradistinguished.                     --Locke.
   [1913 Webster]