dichromatism

noun

di·​chro·​ma·​tism dī-ˈkrō-mə-ˌti-zəm 

: partial color blindness in which only two colors are perceptible

Word History

Etymology

dichromat(ic) + -ism

First Known Use

1859, in the meaning defined above

Medical Definition

dichromatism

noun

di·​chro·​ma·​tism dī-ˈkrō-mə-ˌtiz-əm 

1

: the state or condition of being dichromatic

2

: partial color blindness in which only two colors are perceptible