The Collaborative International Dictionary of English v.0.48:

Contrast \Con*trast"\, v. i. [imp. & p. p. Contrasted; p. pr.
   & vb. n. Contrasting.] [F. contraster, LL. contrastare to
   resist, withstand, fr. L. contra + stare to stand. See
   Stand.]
   To stand in opposition; to exhibit difference, unlikeness, or
   opposition of qualities.
   [1913 Webster]

         The joints which divide the sandstone contrast finely
         with the divisional planes which separate the basalt
         into pillars.                            --Lyell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

contrasting
    adj 1: strikingly different; tending to contrast; "contrasting
           (or contrastive) colors" [syn: contrasting,
           contrastive]