Dictionary.com
Thesaurus.com

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-

Compare meaning

How does extensor compare to similar and commonly confused words? Explore the most common comparisons:

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

The same approach makes it possible to control different finger movements that are selected with the simultaneous activation of both flexor and extensor muscle groups.

From Science Daily Dec. 5, 2023

Twins: RHP Jorge Alcala was placed on the 15-day injured list with a right forearm extensor muscle strain, retroactive to Monday.

From Washington Times May 17, 2023

When the mastoido-humeral contracts, taking its fixed point above, it acts as an extensor of the humerus, and carries the entire fore-limb forwards.

From Artistic Anatomy of Animals by Cuyer, ?douard

Vocabulary.com logo
by dictionary.com

Dictionary.com's Learning Companion

Go beyond just looking up words.
Remember them forever with VocabTrainer.

Start training