ˈtrīˌseps noun
( plural triceps·es -psə̇z ; also triceps )
Etymology: New Latin tricipit-, triceps, from Latin, three-headed, from tri- + -cipit, -ceps (from capit-, caput head) — more at head
: a muscle that arises from three heads:
a. : the great extensor muscle situated along the back of the upper arm, arising by three heads, and inserted into the olecranon at the elbow
b. : the gastrocnemius and soleus muscles viewed as constituting together one muscle