Definition of "carat" [car•at]

• A unit of weight for precious stones, equal to 200 milligrams. (noun)
• Variant of karat. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A carat is 1/5 of a gram and about the size of a pink pearl eraser on a number-two pencil."
• "The first of these is referred to as the carat, which is a measurement of the weight."
• "- A carat is the unit of measure used to gauge the weight of precious stones, including diamonds."