From 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]
From WordNet (r) 3.0 (2006) :
contrasting
adj 1: strikingly different; tending to contrast; "contrasting
(or contrastive) colors" [syn: contrasting,
contrastive]