color-blind

The term is a transparent English compound, formed by directly combining the noun 'color' with the adjective 'blind'. It first emerged in the mid-19th century in a medical context to literally describe a physiological inability to perceive certain hues. The metaphorical sense, denoting a refusal to acknowledge racial differences, developed in the mid-20th century, primarily in American English. This figurative usage extends the literal meaning of visual deficiency to a professed social or cognitive deficiency, creating a powerful, though sometimes contested, analogy for advocating racial equality.

Structure: color + blind - color: From Latin color (hue, tint, appearance). In this compound, it functions as a noun specifying the domain of the condition. - blind: From Old English blind (sightless, unable to see). In this compound, it functions as an adjective indicating a lack or deficiency.