biceps

[bahy-seps]
noun, plural bicepses [bahy-sep-siz] , biceps. Anatomy.
either of two flexor muscles, one (biceps brachii) located in the front of the upper arm and assisting in bending the arm, and the other (biceps femoris) located on the back of the thigh and assisting in bending the leg.

Origin:
1625–35; < Latin: two-headed, having two parts, equivalent to bi- bi-1 + -ceps (stem -cipit-), combining form of caput head

Dictionary.com Unabridged

bicep

[bahy-sep] ,
noun
a biceps muscle, especially the one at the front of the upper arm.

Origin:
1955–60; back formation from biceps

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
biceps (ˈbaɪsɛps)
 
n , pl -ceps
anatomy any muscle having two heads or origins, esp the muscle that flexes the forearmRelated: bicipital
 
Related: bicipital
 
[C17: from Latin: having two heads, from bi-1caput head]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

biceps
1630s, from L. biceps "having two parts," lit. "two-headed," from bis "double" + -ceps comb. form of caput "head" (see head). Despite the -s it is singular, and there is no such word as bicep.

bicep
false sing. of biceps (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

biceps bi·ceps (bī'sěps')
n. pl. biceps or bi·ceps·es (-sěp'sĭz)

  1. A muscle with two heads or points of origin.

  2. The large muscle at the front of the upper arm that flexes the forearm.

  3. The large muscle at the back of the thigh that flexes the knee joint.


bi·cip'i·tal (-sĭp'ĭ-tl) adj.
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
biceps   (bī'sěps')  Pronunciation Key 


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Either of two muscles, biceps brachii of the arm or biceps femoris of the leg, each with two points of origin. The biceps of the arm bends the elbow, while the biceps of the leg helps to bend the knee as part of the hamstring.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
With his immense biceps and brutish energy, he is all power and violence.
Worthington's main acting talent seems to be grunting and flexing his biceps.
The tight-fitting fabric around his biceps and thighs reduces muscle vibration,
  and hence fatigue.
Other tent-pole movies and burly sequels also flexed their biceps.
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