extortor

extorsion

 [eks-tor´shun]
tilting of the upper part of the vertical meridian of the eye away from the midline of the face.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ex·tor·tor

(eks-tōr'tor, -tōr),
An outward rotator.
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