carat

Từ điển Oxford Advanced Learner 8th

carat [carat carats] BrE [ˈkærət] NAmE [ˈkærət] noun (abbr.ct)
1. a unit for measuring the weight of diamonds and other ↑precious stones, equal to 200 milligrams
2. (especially BrE) (NAmE usually karat)a unit for measuring how pure gold is. The purest gold is 24 carats
•an 18-carat gold ring
See also: ↑karat

Word Origin:
late 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.

• Từ đồng nghĩa / Synonyms:
  karat, kt