extensor Meaning, Definition & Usage

  1. noun a skeletal muscle whose contraction extends or stretches a body part
    extensor muscle.

WordNet

Ex*ten"sor noun
Etymology
L., one who stretches. See Extend.
Definitions
  1. (Anat.) A muscle which serves to extend or straighten any part of the body, as an arm or a finger; -- opposed to flexor.

Webster 1913