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Adjective: trichromatic  ,trI-krow'ma-tik
  1. Having or involving three colours
    "trichromatic vision"; "a trichromatic printing process"; "trichromatic staining is the staining of tissue samples differentially in three colours";
    - trichrome, tricolor [US], tricolour [Brit, Cdn]

See also: colored [US], colorful [US], coloured [Brit, Cdn], colourful [Brit, Cdn]

Encyclopedia: Trichromatic