rotator

[roh-tey-ter or, esp. British, roh-tey-]
noun, plural rotators for 1, 3, rotatores [roh-tuh-tawr-eez, -tohr-] , for 2.
1.
a person or thing that rotates.
2.
Anatomy. a muscle serving to rotate a part of the body.
3.
Nautical. a bladed device streamed to rotate in the water to actuate a patent log.

Origin:
1670–80; < Latin rotātor, equivalent to rotā(re) (see rotate1) + -tor -tor

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Collins
World English Dictionary
rotator (rəʊˈteɪtə)
 
n
1.  a person, device, or part that rotates or causes rotation
2.  anatomy any of various muscles that revolve a part on its axis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

rotator ro·ta·tor (rō'tā'tər)
n.
A muscle that serves to rotate a part of the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The lower part of the muscle also acts as an adductor and external rotator of the limb.
That's one of the rotator cuff muscles, which have ended many a major league pitching career.
His arm had gone dead, an archaic diagnosis that today usually means a damaged rotator cuff or other such medical problem.
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