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Definition of carat


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car·at  audio  (krt) KEY  

NOUN:
Abbr. c or car.
  1. A unit of weight for precious stones, equal to 200 milligrams.
  2. Variant of karat.

ETYMOLOGY:
Middle English, from Old French, from Medieval Latin quartus, from Arabic qr, weight of four grains, from Greek kertion, a weight, diminutive of keras, kert-, horn; see ker- 1 in Indo-European roots


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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