triceps

trīceps cipitis, adj.

tres+caput, with three heads, triple-headed : Cerberus.—Poet.: Hecate, of three forms (as also Luna and Diana), O.

triceps
trīceps, cĭpĭtis, adj. [tres-caput; cf. Cic. Or. 48, 159]. I Lit., having three heads , triple-he...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Triceps
·noun A muscle having three heads; specif., the great extensor of the forearm, arising by three head...

Webster's Dictionary of the English Language