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di·chro·ma·tism(dī-krō′mə-tĭz′əm) also di·chro·mism (-mĭz′əm)
1. The quality or condition of having or exhibiting two colors.
2. 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.
di′cro·mat′ic (-măt′ĭk) adj.
the state of being dichromic