carat definition by Webster's New World
- a unit of weight for precious stones and pearls, equal to 3.0864 grains (200 milligrams): abbrev. C
Origin: French ; from Italian carato ; from Arabic qīrāt, pod, husk, weight of 4 grains ; from Classical Greek keration, little horn, carob seed, carat, diminutive of keras, horn
carat definition by American Heritage Dictionary
noun Abbr. c or car.
- A unit of weight for precious stones, equal to 200 milligrams.
- Variant of karat.
Origin: Middle English, from Old French, from Medieval Latin quarātus, from Arabic qīrāṭ, weight of four grains, from Greek kerātion, a weight, diminutive of keras, kerāt-, horn; see ker-1 in Indo-European roots.