Pronunciation: eks-ten'sor, -sor
A muscle the contraction of which causes movement at a joint with the consequence that the limb or body assumes a more straight line, or so that the distance between the parts proximal and distal to the joint is increased or extended; the antagonist of a flexor.
[L. one who stretches, fr. ex-tendo, to stretch out]
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Examples: glitazone, GI cocktail, etc.