triceps
noun
tri·ceps ˈtrī-ˌseps 
plural triceps
: a muscle that arises from three heads
especially : the large extensor muscle along the back of the upper arm
Example Sentences
He felt a pain in his right triceps.
Recent Examples on the Web Manager David Ross sounded optimistic during the Cubs’ trip in New York earlier this week that Contreras (left ankle) and Hoerner (right triceps) would be ready to return to the lineup after Thursday’s off day. 
Meghan Montemurro, Chicago Tribune, 17 Sep. 2022 Left-hander Anthony Gose is dealing with a strained left triceps and soreness in the left elbow. Paul Hoynes, cleveland, 23 July 2022 Then press up, locking your elbows to put tension on your triceps at the back of your arms. Erin Beresini, Outside Online, 27 May 2015 The dip station can be used to build your triceps, chest, core, shoulder muscles, and overall body strength. Kathleen Willcox, Popular Mechanics, 4 Sep. 2022 There’s a simple pressdown fix, however, that will bring the focus back to only your triceps. Jeff Tomko, Men's Health, 30 July 2022 For any effective arms workout—like in this one—you’ll want to include moves that target both the front of your arms (your biceps) and exercises that hit the back of your upper arms (your triceps). Manee Magee, SELF, 23 July 2022 When a body part is pressed against a surface, like the floor, resistance is sent back into your trunk and the chain of body parts for that particular exercise, which in this case include the chest, shoulders, triceps, core, back and legs. Jen Murphy, WSJ, 13 Aug. 2022 Fagan suggests doing this three-move routine–which targets all of your chest muscles, as well as your shoulders, triceps, and core—twice a week. Jenny Mccoy, SELF, 26 Mar. 2022 See More
Meghan Montemurro, Chicago Tribune, 17 Sep. 2022 Left-hander Anthony Gose is dealing with a strained left triceps and soreness in the left elbow. Paul Hoynes, cleveland, 23 July 2022 Then press up, locking your elbows to put tension on your triceps at the back of your arms. Erin Beresini, Outside Online, 27 May 2015 The dip station can be used to build your triceps, chest, core, shoulder muscles, and overall body strength. Kathleen Willcox, Popular Mechanics, 4 Sep. 2022 There’s a simple pressdown fix, however, that will bring the focus back to only your triceps. Jeff Tomko, Men's Health, 30 July 2022 For any effective arms workout—like in this one—you’ll want to include moves that target both the front of your arms (your biceps) and exercises that hit the back of your upper arms (your triceps). Manee Magee, SELF, 23 July 2022 When a body part is pressed against a surface, like the floor, resistance is sent back into your trunk and the chain of body parts for that particular exercise, which in this case include the chest, shoulders, triceps, core, back and legs. Jen Murphy, WSJ, 13 Aug. 2022 Fagan suggests doing this three-move routine–which targets all of your chest muscles, as well as your shoulders, triceps, and core—twice a week. Jenny Mccoy, SELF, 26 Mar. 2022 See More Word History
Etymology
New Latin tricipit-, triceps, from Latin, three-headed, from tri- + capit-, caput head — more at head
First Known Use
1676, in the meaning defined above
Medical Definition
triceps
noun
tri·ceps ˈtrī-ˌseps
plural triceps also tricepses
: 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