[ik-sten-ser, -sawr]

noun Anatomy.

a muscle that serves to extend or straighten a part of the body.

Origin of extensor

1700–10; < New Latin, equivalent to Latin extend(ere) to extend + -tor -tor, with -dt- > -s-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of extensor

British Dictionary definitions for extensor



any muscle that stretches or extends an arm, leg, or other bodily partCompare flexor

Word Origin for extensor

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

Word Origin and History for extensor

1713, short for medical Latin musculus extensor, from Late Latin extensor "stretcher," agent noun from Latin extensus (see extend).

Online Etymology Dictionary, © 2010 Douglas Harper

extensor in Medicine




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.

extensor in Science



A muscle that extends or straightens a limb or joint. Compare flexor.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.