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

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, "Andrew Benintendi gets day off to get refocused," 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, "Broke Your Right Arm? Exercise Your Left. It May Help, Really.," 16 May 2018 These same volunteers’ wrist extensor muscles, which had not been exercised in their right wrists, were atrophied on the left. Gretchen Reynolds, New York Times, "Broke Your Right Arm? Exercise Your Left. It May Help, Really.," 16 May 2018 Karns, who missed most of last season after straining an extensor muscle in his right arm and undergoing surgery to relieve thoracic outlet syndrome, fought through the spring to earn a spot in the Royals' starting lineup. Maria Torres, kansascity, "After return from DL, Nate Karns will pitch out of Royals' bullpen | The Kansas City Star," 29 Mar. 2018 Movement in the hip flexors (on the front of the body) and the hip extensors (on the back of the body) should initiate from the the femur bones in the upper thighs rather than the pelvis. Anthea Levi, Health.com, "This Common Mistake Can Ruin Your Barre and Pilates Workouts," 1 Mar. 2018 Nathan Karns: Placed on the disabled list because of right extensor strain/nerve irritation. Pete Grathoff, kansascity, "How Dayton Moore has reshaped the Royals roster since opening day," 31 July 2017 The Angels announced that tightness was in Shoemaker’s extensor muscle, which is on top of the forearm. Jeff Fletcher, Orange County Register, "Matt Shoemaker hurt on night Angels rally for victory over Yankees," 14 June 2017 Injuries: Royals - LHP Scott Alexander (right hamstring), 3B Hunter Dozier (left oblique), LHP Brian Flynn (rig) and RHP Nate Karns (right extensor) are on the disabled list. Paul Hoynes, cleveland.com, "Cleveland Indians, Kansas City Royals series preview, pitching matchups," 26 May 2017

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.

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First Known Use of extensor

1615, in the meaning defined above

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Statistics for extensor

Last Updated

9 Jul 2019

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Time Traveler for extensor

The first known use of extensor was in 1615

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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

More from Merriam-Webster on extensor

Rhyming Dictionary: Words that rhyme with extensor

Comments on extensor

What made you want to look up extensor? Please tell us where you read or heard it (including the quote, if possible).


something desired as essential

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