D defs.my
Entry 2 senses Webster, 1913

Carat

/(kăr"ăt)/ · Car·at · IPA /ˈkæ.ɹət/
01 n. The weight by which precious stones and pearls are weighed.
  1. 1.
    The weight by which precious stones and pearls are weighed.
  2. 2.
    A twenty-fourth part; -- a term used in estimating the proportionate fineness of gold.