protractor Hear it!

protractor definition

pro·trac·tor (prō′trak′tər, prō trak′-)

noun

  1. a person or thing that protracts
  2. an instrument in the form of a graduated semicircle, used for plotting and measuring angles
  3. Anat. a muscle that protracts, or extends, a limb

Etymology: ML

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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