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Pronunciation: pro-trak'tor, -tor

Definition: A muscle drawing a part forward, as antagonistic to a retractor (the serratus anterior muscle is a protractor of the scapula; the lateral pterygoid muscle is a protractor of the mandible).

[L. pro-traho, pp. -tractus, to draw forth]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.