dichromatism

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

Definition of dichromatism 

: partial color blindness in which only two colors are perceptible

First Known Use of dichromatism

circa 1901, in the meaning defined above

History and Etymology for dichromatism

dichromat(ic) + -ism

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The first known use of dichromatism was circa 1901

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dichromatism

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

Medical Definition of dichromatism 

1 : the state or condition of being dichromatic

2 : partial color blindness in which only two colors are perceptible

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