/kar"euht/ , n.
1. a unit of weight in gemstones, 200 milligrams (about 3 grains of troy or avoirdupois weight). Abbr.: c., ct.
2. karat.
[ 1545-55; carratus (used by alchemists) qirat weight of 4 grains kerátion carob bean, weight of 3 1 / 3 grains, lit., little horn, equiv. to kerat- (s. of kéras ) horn + -ion dim. suffix ]