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extensor

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

noun

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


extensor British  
/ ɪkˈstɛnsə, -sɔː /

noun

  1. any muscle that stretches or extends an arm, leg, or other bodily part Compare flexor

"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

extensor Scientific  
/ ĭk-stĕnsər /
  1. A muscle that extends or straightens a limb or joint.

  2. Compare flexor


Etymology

Origin of extensor

1700–10; < New Latin, equivalent to Latin extend ( ere ) to extend + -tor -tor, with -dt- > -s-

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Vocabulary lists containing extensor

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Hernández repaired a torn extensor tender in his left elbow after the season, which will cause him to miss next month’s World Baseball Classic and the start of the 2026 season.

From Los Angeles Times Feb. 12, 2026

Spieth has been dealing with an injury to his extensor carpi ulnaris, a major tendon in the wrist.

From Seattle Times Apr. 10, 2024

If the wrist extensor muscles are contracted, the fingers re-open and the hand releases the pen.

From Science Daily Dec. 5, 2023

Clarke Schmidt had been in the mix but has been shut down for three to four weeks due to a strained common extensor tendon near his elbow in his right arm.

From Washington Times Feb. 22, 2021

The semi-membranosus is an extensor of the thigh when it takes its fixed point at the pelvis; it is also an adductor of the lower limb.

From Artistic Anatomy of Animals by ?douard Cuyer

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