tri·​ceps | \ ˈtrī-ˌseps How to pronounce triceps (audio) \
plural triceps

Definition of triceps

: a muscle that arises from three heads especially : the large extensor muscle along the back of the upper arm

Examples of triceps in a Sentence

He felt a pain in his right triceps.
Recent Examples on the Web Simple tennis balls are Anselm’s go-to for working out kinks behind the shoulder blades or in the triceps, forearms and calves. Fiorella Valdesolo, WSJ, "Lower Back Pain, Sore Necks, Hunched Shoulders: How WFH Isn’t Working for Our Bodies," 6 May 2021 Reliever Garrett Cleavinger left the game after taking a line drive from Tyler Stephenson off his triceps in the ninth inning. Greg Beacham, Star Tribune, "Kershaw dazzles Reds, Dodgers win 8-0 to snap 3-game skid," 28 Apr. 2021 Roberts said Knebel had experienced discomfort in his upper triceps and would undergo tests Saturday. Bill Shaikin, Los Angeles Times, "Like father, like son: Fernando Tatis Jr. mimics dad, powers Padres past Dodgers," 23 Apr. 2021 Detroit was forced to make the pregame pitching change after Teheran complained of tightness in his right triceps at the end of his warmup. Tom Withers, Star Tribune, "Reyes homers twice, Plesac strong as Indians beat Tigers," 9 Apr. 2021 During Teheran's normal throwing progression leading up to the game, the 30-year-old felt tightness in his triceps, the team announced. Evan Petzold, Detroit Free Press, "Detroit Tigers' Julio Teheran scratched with triceps tightness; Derek Holland starts," 10 Apr. 2021 Basically, every muscle except your pectorals and triceps is engaged. Wes Siler, Outside Online, "How to Build a Home Gym for Less than a Membership," 29 Mar. 2021 Lower back, shoulders, glutes, leg abductors, upper back, biceps, triceps, leg adductors, calves, ego, abs. Matt Allyn, Popular Mechanics, "How To Get Started in Cross-Country Skiing," 21 Jan. 2021 Peter Salk, the oldest, recalled their father gathering them near the kitchen table and instructing them to roll up their sleeves and expose their triceps. New York Times, "Vaccine Memories of Another Time and Place," 25 Dec. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'triceps.' 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 triceps

1676, in the meaning defined above

History and Etymology for triceps

New Latin tricipit-, triceps, from Latin, three-headed, from tri- + capit-, caput head — more at head

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Time Traveler for triceps

Time Traveler

The first known use of triceps was in 1676

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Statistics for triceps

Last Updated

12 May 2021

Cite this Entry

“Triceps.” Dictionary, Merriam-Webster, Accessed 14 May. 2021.

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More Definitions for triceps



English Language Learners Definition of triceps

: a large muscle along the back of the upper arm


tri·​ceps | \ ˈtrī-ˌseps How to pronounce triceps (audio) \
plural triceps also tricepses

Medical Definition of triceps

: a muscle that arises from three heads:
a : the large extensor muscle that is situated along the back of the upper arm, arises by the long head from the infraglenoid tubercle of the scapula and by two heads from the shaft of the humerus, is inserted into the olecranon at the elbow, and extends the forearm at the elbow joint

called also triceps brachii

b : the gastrocnemius and soleus muscles viewed as constituting together one muscle

called also triceps surae

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