From The Collaborative International Dictionary of English v.0.44 [gcide]:
Carat \Car"at\ (k[a^]r"[a^]t), noun [F. carat (cf. It. carato, OPg. quirate, Pg. & Sp. quilate), Ar. q[imac]r[=a]t bean or pea shell, a weight of four grains, a carat, fr. Gr. kera'tion a little horn, the fruit of the carob tree, a weight, a carat. See {Horn}.]
1. The weight by which precious stones and pearls are weighed.
Note: The carat equals three and one fifth grains Troy, and is divided into four grains, sometimes called carat grains. Diamonds and other precious stones are estimated by carats and fractions of carats, and pearls, usually, by carat grains. --Tiffany.
2. A twenty-fourth part; -- a term used in estimating the proportionate fineness of gold.
Note: A mass of metal is said to be so many carats fine, according to the number of twenty-fourths of pure gold which it contains; as, 22 carats fine (goldsmith's standard) = 22 parts of gold, 1 of copper, and 1 of silver.
From WordNet (r) 2.0 [wn]:
noun
1: a unit of weight for precious stones = 200 mg
2: the unit of measurement for the proportion of gold in an alloy; 18-karat gold is 75% gold; 24-karat gold is pure gold [syn: {Karat}]
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