Wordnet 3.0
NOUN (1)
1.
any skeletal muscle having three origins (but especially the triceps brachii);
The Collaborative International Dictionary of English v.0.48:
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.
[1913 Webster]
WordNet (r) 3.0 (2006):
triceps
n 1: any skeletal muscle having three origins (but especially
the triceps brachii)