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8 Words That Are Older Than You Think

triceps

[trahy-seps] /ˈtraɪ sɛps/
noun, plural tricepses
[trahy-sep-siz] /ˈtraɪ sɛp sɪz/ (Show IPA),
triceps. Anatomy
1.
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
1570-1580
1570-80; < Latin: three-headed, equivalent to tri- tri- + -ceps, stem -cipit- -headed, derivative of caput head
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tricepses

triceps

/ˈtraɪsɛps/
noun (pl) -cepses (-sɛpsɪz), -ceps
1.
any muscle having three heads, esp the one (triceps brachii) that extends the forearm
Word Origin
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
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Word Origin and History for tricepses

triceps

n.

"the great extensor muscle," 1704, from Latin triceps "three-headed," from tri- "three" (see tri-) + -ceps, from caput "head" (see capitulum). So called because the muscle has three origins.

Online Etymology Dictionary, © 2010 Douglas Harper
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tricepses in Medicine

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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tricepses in Science
triceps
  (trī'sěps')   
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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