One of the mysteries of the English language finally explained.
Abnormal brown pigmentation of tissue (especially cartilage and ligaments), specifically that resulting from the accumulation of a melanin-like pigment derived from homogentisic acid in the metabolic disorder alkaptonuria.
Mid 19th century. From German Ochronosis from ancient Greek ὠχρός pale yellow + νόσος disease + -osis.
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