Hypertext Webster Gateway: "extensor"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Extensor \Ex*ten"sor\, n. [L., one who stretches. See {Extend}.]
(Anat.)
A muscle which serves to extend or straighten any part of the
body, as an arm or a finger; -- opposed to flexor.
From WordNet (r) 1.7 (wn)
extensor
n : a skeletal muscle whose contraction extends or stretches a
body part [syn: {extensor muscle}] [ant: {flexor muscle}]
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