tricepses

triceps

[trahy-seps]
noun, plural tricepses [trahy-sep-siz] , triceps. Anatomy.
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:
1570–80; < Latin: three-headed, equivalent to tri- tri- + -ceps, stem -cipit- -headed, derivative of caput head

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World English Dictionary
triceps (ˈtraɪsɛps)
 
n , pl -cepses, -ceps
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 10th Edition
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Etymonline
Word Origin & History

triceps
"the great extensor muscle," 1704, from L. triceps "three-headed," from tri- "three" + -ceps, from caput "head" (see head). So called because the muscle has three origins.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

triceps tri·ceps (trī'sěps')
n. pl. tri·ceps·es (-sěp'sĭz) or triceps

  1. 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.

  2. 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.
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American Heritage
Science Dictionary
triceps   (trī'sěps')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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