extensor

• POS: Noun
• HYPHEN: ex=ten=sor

CIDE DICTIONARY

extensor, n. [L., one who stretches. See Extend.].

 A muscle which serves to extend or straighten any part of the body, as an arm or a finger; -- opposed to flexor.  [1913 Webster]

OXFORD DICTIONARY

extensor, n. (in full extensor muscle) Anat. a muscle that extends or straightens out part of the body (cf. FLEXOR).

Etymology

mod.L (as EXTEND)