One of the mysteries of the English language finally explained.
1A unit of weight for precious stones and pearls, now equivalent to 200 milligrams.‘a half-carat diamond ring’
2chiefly British spelling of karat
Late Middle English ( carat (sense 2 of the noun)): from French, from Italian carato, from Arabic ḳīrāṭ (a unit of weight), from Greek keration ‘fruit of the carob’ (also denoting a unit of weight), diminutive of keras ‘horn’, with reference to the elongated seedpod of the carob.
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