extensor

  

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-

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
extensor (ɪkˈstɛnsə, -sɔː) [Click for IPA pronunciation guide]
 
—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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00:10
Extensor is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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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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