Definify.com

Webster 1913 Edition

Noun.

[NL.]

(Anat.)

A muscle which bends or flexes any part;

as, the

flexors

of the arm or the hand

; – opposed to

extensor

Noun.

In anatomy, a muscle whose office is to bend the part to which it belongs, in opposition to the extensors.

flexor ‎(plural flexors)

(anatomy) A muscle whose contraction acts to bend a joint or limb.
- 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.

muscle

Ido: flexanto
Occitan: flageire m, flageira f, feblaire m, feblaira f, gimblaire m, gimblaira f