Carat meaning

kăr'ət
A unit of weight for precious stones, equal to 200 milligrams.
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A unit of weight for precious stones and pearls, equal to 3.0864 grains (200 milligrams): abbrev. C.
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A unit of weight for precious stones and pearls, equivalent to 200 milligrams.
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Formerly, any of several units of weight, varying from 189 to 212 mg, the weight of a carob seed.
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A measure of the purity of gold, pure gold being 24 carats.
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Origin of carat

  • Middle English from Old French from Medieval Latin quarātus from Arabic qīrāṭ a measure of weight from Greek kerātion carob pod, a measure of weight (originally defined in reference to a dried carob seed) from diminutive of keras, kerāt- horn (from the pod's shape) ker-1 in Indo-European roots
    From American Heritage Dictionary of the English Language, 5th Edition
  • Middle French carat, from Italian carato, from Arabic قيراط (qirāṭ, “husk”), from Ancient Greek κεράτιον (keration, “carob seed”), diminutive form of κέρας (keras, “horn”).
    From Wiktionary