Triceps

• POS: Noun
• HYPHEN: tri=ceps

CIDE DICTIONARY

Triceps, n. [NL., fr. L. triceps, having three beads; tres, tria, three + caput head: cf. F. triceps. See Three, and Chief.].

 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]

OXFORD DICTIONARY

Triceps, adj. & n.
--adj. (of a muscle) having three heads or points of attachment.
--n. any triceps muscle, esp. the large muscle at the back of the upper arm.

Etymology

L, = three-headed (as TRI-, -ceps f. caput head)