Color-blindness
noun
1.
inability to distinguish one or several chromatic colors, independent of the capacity for distinguishing light and shade.
2.
complete inability to distinguish colors of the spectrum, with all objects appearing as shades of gray, black, and white, varying only as to lightness and darkness; achromatopsia.
n.
1844, replacing Daltonism (after English chemist John Dalton, 1766-1844, who published a description of it in 1794); in figurative use, with reference to race or ethnicity, attested from 1866, American English. Related: color blind (adj.).
color blindness n.
Deficiency of color perception, whether hereditary or acquired, partial or complete.
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