dichromatism

1. The quality or condition of being dichromatic.
2. 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.

1. The state of being dichromatic.
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 retinal cone pigments. Also called dichromatopsia, dyschromatopsia, parachromatopsia.

1. the quality of existing in or exhibiting two different colors.
2. dichromatopsia.

The noun has one meaning:

Meaning #1: a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)
  Synonyms: dichromacy, dichromatopsia, dichromia, dichromasy