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left: biceps relaxed to extend forearm
right: biceps contracted to raise forearm
bi·ceps (bsps) KEY
pl. biceps or bi·ceps·es (-spsz) KEY
- A muscle with two heads or points of origin.
- The large muscle at the front of the upper arm that flexes the forearm.
- The large muscle at the back of the thigh that flexes the knee joint.
From Latin, two-headed : bi-, two ; see bi-1 + caput, head; see kaput- in Indo-European roots