Extensor

Full definition of extensor

Noun

1. (anatomy) A muscle whose contraction extends or straightens a limb or body part.
• 2004, Jean-Pierre Hourdebaigt, Canine Massage: A Complete Reference ManualStarting at the point of shoulder, use muscle squeezings, picking-ups, kneadings and gentle frictions, interspersed with effleurages, over the triceps muscle as well as the fleshy part of the flexor and extensor muscle groups.