三头肌
Triceps \Tri"ceps\, n. [NL., fr. L. triceps, having three beads; tres, tria, three + caput head: cf. F. triceps. See {Three}, and Chief.] (Anat.) A muscle having three heads; specif., the great extensor of the forearm, arising by three heads and inserted into the olecranon at the elbow.
triceps n : any skeletal muscle having three origins (but especially the triceps brachii)