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extensor

[ik-sten-ser, -sawr] /ɪkˈstɛn sər, -sɔr/
noun, Anatomy
1.
a muscle that serves to extend or straighten a part of the body.
Origin
1700-1710
1700-10; < Neo-Latin, equivalent to Latin extend(ere) to extend + -tor -tor, with -dt- > -s-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ex-tensor

extensor

/ɪkˈstɛnsə; -sɔː/
noun
1.
any muscle that stretches or extends an arm, leg, or other bodily part Compare flexor
Word Origin
C18: from New Latin, from Latin extensus stretched out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ex-tensor in Medicine

extensor ex·ten·sor (ĭk-stěn'sər)
n.
A muscle that extends or straightens a limb or body 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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ex-tensor in Science
extensor
  (ĭk-stěn'sər)   
A muscle that extends or straightens a limb or joint. Compare flexor.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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