carat - definition and synonyms

noun [countable] 

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/ˈkærət/
singularcarat
pluralcarats
  1. 1
    a unit for measuring how pure gold is

    an 18-carat gold ring

  2. 2
    a unit for measuring the weight of diamonds and other jewels. It is equal to 0.2 grams

    a 30-carat diamond