- The triceps is the muscle that runs along the back of the upper arm.
An example of a triceps is the muscle used to extend your forearm.
nounpl. triceps triceps
A large three-headed muscle running along the back of the upper arm and serving to extend the forearm.
Origin of tricepsFrom Latin, three-headed : tri-, tri- + caput, head; see kaput- in Indo-European roots.
(plural triceps or tricepses)
- (anatomy) Any muscle having three heads.
- (anatomy) Specifically, the triceps brachii.
From Latin trīceps (“triple-headed”), from trēs (“three”) + caput (“head”).
Variant of triceps