/buy"seps/ , n. , pl. bicepses /-sep siz/ , biceps . Anat.
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; bi- BI- 1 + -ceps (s. -cipit- ), comb. form of caput head ]