The Collaborative International Dictionary of English v.0.48:

Bicolor \Bi"col`or\, Bicolored \Bi"col`ored\, a. [L. bicolor;
   bis twice + color color.]
   Of two colors.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bicolored
    adj 1: having two colors; "a bicolor flower"; "a bicolored
           postage stamp" [syn: bicolor, bicolour, bicolored,
           bicoloured, bichrome, dichromatic]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "bicolored":
   bicolor, colorful, colory, crazy, daedal, dichromatic,
   divers-colored, harlequin, kaleidoscopic, many-colored, medley,
   motley, multicolor, multicolored, multicolorous, parti-color,
   parti-colored, polychromatic, polychrome, polychromic, prismal,
   shot, shot through, spectral, thunder and lightning, trichromatic,
   trichromic, tricolor, tricolored, two-tone, varicolored,
   variegated, versicolor, versicolored