pro-tractor

protractor

[proh-trak-ter, pruh-]
noun
1.
a person or thing that protracts.
2.
(in surveying, mathematics, etc.) an instrument having a graduated arc for plotting or measuring angles.
3.
Anatomy. a muscle that causes a part to protrude.

Origin:
1605–15; < Medieval Latin; see protract, -tor

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
protractor (prəˈtræktə)
 
n
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
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Etymonline
Word Origin & History

protractor
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-)
n.
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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