Definition of carat noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈkærət//
    ; NAmE NAmE//ˈkærət//
    (abbreviation ct)
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  1. 1a unit for measuring the weight of diamonds and other precious stones, equal to 200 milligrams
  2. 2(especially British English) (usually North American English karat) a unit for measuring how pure gold is. The purest gold is 24 carats. an 18-carat gold ring
  3. Word Originlate Middle English (in sense (2)): from French, from Italian carato, from Arabic qīrāṭ (a unit of weight), from Greek keration ‘fruit of the carob tree’ (also denoting a unit of weight), diminutive of keras ‘horn’, with reference to the elongated seed pod of the carob.
See the Oxford Advanced American Dictionary entry: carat