One of the mysteries of the English language finally explained.
Inability to distinguish between some or (usually) all colours; absence, severe impairment, or loss of colour vision; colour blindness, especially monochromatism.
Mid 19th century; earliest use found in The Lancet. From German Achromatopsie, † Achromatopsia from ancient Greek ἀχρώματος + Hellenistic Greek -οψία.
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