(adj) having or involving three colors, Syn. tricolor, trichrome, Example:trichromatic vision; a trichromatic printing process; trichromatic staining is the staining of tissue samples differentially in three colors; tricolor plumage; a tricolor process in photography
a. [ Pref. tri- + chromatic. ] (Zool.) Having or existing in three different phases of color; having three distinct color varieties; -- said of certain birds and insects. [ 1913 Webster ]