[bahy-sep] ,
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. 2014.
Cite This Source Link To bicep
Example sentences
So the next time you're faced with a choice that takes self-control, clench
  your fist or firm that bicep.
He started plunging the needle deep into his bicep, shooting heroin directly
  into the muscle.
Pull from your core rather than with your bicep, keeping your leading arm
  straight and guiding the blade fully into the water.
He also has two unidentified tattoos on his left bicep.
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