ex·​ten·​sor | \ ik-ˈsten(t)-sər How to pronounce extensor (audio) \

Definition of extensor

: a muscle serving to extend a bodily part (such as a limb)

Examples of extensor in a Sentence

Recent Examples on the Web Without proper coaching cues, however, many runners do not extend the hips properly and incorporate mostly the helper hip extensor muscles, like the hamstrings, whilst not activating the Gluteus Maximus at all. Jon-erik Kawamoto, Outside Online, 11 Aug. 2020 Jin had previously damaged the tendons in his left index finger and underwent surgery to repair its extensor, which Big Hit informed ARMY about in March. Hannah Dailey, Billboard, 8 Apr. 2022 Generally, pain on the top of the foot is an inflammation of the tendons that straighten the toes, which run along the top of the foot and are called extensor tendons. Jeff Gaudette, Outside Online, 12 Oct. 2021 Thus, the clinical name for this injury is extensor tendonitis. Jeff Gaudette, Outside Online, 12 Oct. 2021 The problem is, this creates tightness in your extensor muscles (think triceps, quads, and back extensors), which can impact your form and increase your risk of injury. Pam Moore, SELF, 25 Aug. 2021 My left index finger would scoop a small chunk of Tiger Balm and slowly spread it over my right arm extensor muscle down to my wrist and then to my palm and finger tips, all five of them. Longreads, 4 Mar. 2020 Hembree was 1-0 with a 2.51 ERA in 31 appearances before going on the disabled list June 14 with a right elbow extensor strain. Julian Benbow, BostonGlobe.com, 4 July 2019 Using ultrasound and CT scans, the scientists determined the precise dimensions of two separate sets of muscles in that joint: the extensors, which move the wrist back and away from the body; and the flexors, which pull it in, toward the forearm. Gretchen Reynolds, New York Times, 16 May 2018 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'extensor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of extensor

1615, in the meaning defined above

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Time Traveler for extensor

Time Traveler

The first known use of extensor was in 1615

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Dictionary Entries Near extensor



extensor thrust

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Statistics for extensor

Last Updated

22 May 2022

Cite this Entry

“Extensor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extensor. Accessed 30 Jun. 2022.

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More Definitions for extensor


ex·​ten·​sor | \ ik-ˈsten(t)-sər How to pronounce extensor (audio) , -sȯ(ə)r How to pronounce extensor (audio) \

Medical Definition of extensor

: a muscle serving to extend a bodily part (as a limb)

called also extensor muscle

— compare flexor


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