[proh-trak-ter, pruh-]
a person or thing that protracts.
(in surveying, mathematics, etc.) an instrument having a graduated arc for plotting or measuring angles.
Anatomy. a muscle that causes a part to protrude.

1605–15; < Medieval Latin; see protract, -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
protractor (prəˈtræktə)
1.  an instrument for measuring or drawing angles on paper, usually a flat semicircular transparent plastic sheet graduated in degrees
2.  a person or thing that protracts
3.  a surgical instrument for removing a bullet from the body
4.  anatomy a former term for extensor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1610s, "one who lengthens (an action)," agent noun from L. protrahere see protract); sense of "instrument for drawing angles" first recorded 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

protractor pro·trac·tor (prō-trāk'tər, prə-)
A muscle that extends a limb or other part.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The protractor muscles of their beaks allow them to pry and to probe better
  than other birds.
He hates that people know he's good at math and carries around a protractor.
Glue the protractor to a piece of cardboard as shown in the illustration.
The first part is a hands-on activity using string, chalk, and protractor.
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