di·chro·ma·tism (dī-krōmə-tĭzəm) also di·chro·mism (-mĭzəm)
n.
► The quality or condition of being dichromatic.
► Pathology. A form of colorblindness in which only two of the three fundamental colors can be distinguished due to a lack of one of the cone pigments.

[TahlilGaran] American Dictionary ▲