/ Dictionary / Index C carat: Meaning and Definition of Find definitions for: car•at Pronunciation: (kar'ut), [key] — n. a unit of weight in gemstones, 200 milligrams (about 3 grains of troy or avoirdupois weight). Abbr.: c., ct. karat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: carat (Thesaurus) carapace Caratinga Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language