Word

dichromatism, n.
(dichromatisms)

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)
<noun.state>

dichromacy dichromasy dichromatism dichromatopsia dichromia

lexical pointers

derivationally related form

dichromatic

semantic pointers

hypernym

color blindness, colour blindness, color vision deficiency, colour vision deficiency

hyponym

red-green dichromacy, red-green color blindness, red-green colour blindness yellow-blue dichromacy, yellow-blue color blindness