- a muscle having three heads or points of origin, especially the muscle on the back of the arm, the action of which straightens the elbow.
Origin of triceps
1570–80; < Latin: three-headed, equivalent to tri- tri- + -ceps, stem -cipit- -headed, derivative of caput head
- a triceps muscle, especially the one at the back of the upper arm.
Origin of tricep
First recorded in 1990–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for triceps
Your triceps muscle, stationed on the underside of your upper arm, shortened.Cool It on the CrossFit: What’s Rhabdomyolysis?
October 11, 2013
One was through his bicep, and the other on his triceps, and it looked as though the bullet went straight through.New Orleans Shooting: I Saw the Mother’s Day Parade Gunman
May 13, 2013
The ulna must then be cleared, and the triceps divided at its insertion.A Manual of the Operations of Surgery
It is covered superiorly by the external head of the triceps.
We then shall have an idea of what the triceps is in quadrupeds.
The triceps and radial reflexes were definitely exaggerated.Studies in Forensic Psychiatry
The action of its antagonist, the triceps, may be studied in the same manner.A Practical Physiology
Albert F. Blaisdell
- any muscle having three heads, esp the one (triceps brachii) that extends the forearm
C16: from Latin, from tri- + caput head
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
Word Origin and History for triceps
Online Etymology Dictionary, © 2010 Douglas Harper
- A three-headed muscle of the upper arm, whose long or scapular head has origin from the lateral border of the scapula, the lateral head, origin from the lateral and posterior surface of the humerus, and the medial head from the posterior surface of the humerus; with insertion into the olecranon of the ulna, with nerve supply from the radial nerve, and whose action extends the forearm; the triceps brachii.
- The gastrocnemius and soleus muscles of the calf considered as one muscle; the triceps surae.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- The muscle at the back of the upper arm that raises and lowers the forearm. The triceps has three points of attachment to bone at its origin.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.