extensor

• Rhymes: -ɛnsə(ɹ)

extensor (plural extensors)

1. (anatomy) A muscle whose contraction extends or straightens a limb or body part.
   • 2004, Jean-Pierre Hourdebaigt, Canine Massage: A Complete Reference Manual:

     Starting 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.

   • 2021, Peter Cavanagh, “9. Cranes”, in 100 Flying Birds: Photographing the Mechanics of Flight, →ISBN, page 216:

     The bird is then off on a mad dash like an aquatic Roadrunner cartoon: It spreads its legs wide with strong extensor thrusts and long forward strides, and it then steps in the water four or five times, increasing its speed and flapping its wings until it achieves liftoff with a final drag of its toes in the water.

• flexor
• quadriceps
• triceps

Borrowed from French extenseur.

extensor n (plural extensori)

1. extensor

• IPA^(key): /eɡstenˈsoɾ/ [eɣ̞s.t̪ẽnˈsoɾ]
• Rhymes: -oɾ
• Syllabification: ex‧ten‧sor

extensor (feminine extensora, masculine plural extensores, feminine plural extensoras)

1. extending; that which extends

extensor m (plural extensores)

1. (anatomy) extensor

• “extensor”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025