Dichromatic may refer to:Dichromacy, a form of color-blindness in which only two light wavelengths are distinguished rather than the usual three Dichromatic, describing an optical device which splits light into two parts according to its wavelength: a form of dichroism A form of polymorphism (biology), typical in sexual dimorphism, in which two phenotypes have different colouration or ornamentation. Dichromatic reflectance model Dichromatism: the property of a substance that changes hue due to change in its concentration or the thickness of a layer.