extensor

[ik-sten-ser, -sawr]

ex·ten·sor

[ik-sten-ser, -sawr]
noun Anatomy.
a muscle that serves to extend or straighten a part of the body.

Origin:
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. 2012.
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Extensor is always a great word to know.
So is gray matter. Does it mean:
the part of the large intestine extending from the cecum, where the large intestine begins, to the rectum
nerve tissue of the brain and spinal cord that contains fibers and nerve cell bodies and is a dark reddish-gray color
Collins
World English Dictionary
extensor (ɪkˈstɛnsə, -sɔː)
 
n
Compare flexor any muscle that stretches or extends an arm, leg, or other bodily part
 
[C18: from New Latin, from Latin extensus stretched out]

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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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
extensor   (ĭk-stěn'sər)  Pronunciation Key 
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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