[ ik-sten-ser, -sawr ]
/ ɪkˈstɛn sər, -sɔr /

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

Examples from the Web for extensor

British Dictionary definitions for extensor

/ (ɪkˈstɛnsə, -sɔː) /


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

Medicine definitions for extensor

[ ĭk-stĕnsər ]


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.

Science definitions for extensor

[ ĭk-stĕnsər ]

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.