Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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