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Medical Term:


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.

See: muscle

[L. one who stretches, fr. ex-tendo, to stretch out]

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.