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[bahy-seps] /ˈbaɪ sɛps/
noun, plural bicepses
[bahy-sep-siz] /ˈbaɪ sɛp sɪz/ (Show IPA),
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.
1625-35; < Latin: two-headed, having two parts, equivalent to bi- bi-1 + -ceps (stem -cipit-), combining form of caput head


[bahy-sep] /ˈbaɪ sɛp/
a biceps muscle, especially the one at the front of the upper arm.
1955-60; back formation from biceps Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for biceps
  • 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.
  • Horne had a magnetic resonance imaging exam and was found to have a strained biceps muscle.
  • Manny flexed his biceps after being asked about what kind of shape he's in.
  • For such a delicate result, cream puffs actually require strong biceps.
  • The biceps femoris, one of the hamstring muscles of the underside of each thigh.
British Dictionary definitions for biceps


noun (pl) -ceps
(anatomy) any muscle having two heads or origins, esp the muscle that flexes the forearm related adjective bicipital
Word Origin
C17: from Latin: having two heads, from bi-1caput 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 biceps

1630s (adj.), from Latin biceps "having two parts," literally "two-headed," from bis "double" (see bis-) + -ceps comb. form of caput "head" (see capitulum). As a noun meaning "biceps muscle," from 1640s, so called for its structure. Despite the -s, it is singular, and classicists insist there is no such word as bicep.



false singular of biceps (q.v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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biceps in Medicine

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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biceps in Science

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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