rotator

[roh-tey-ter or, especially Brit., roh-tey-]

ro·ta·tor

[roh-tey-ter or, especially Brit., roh-tey-]
noun, plural ro·ta·tors for 1, 3, ro·ta·tor·es [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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Rotator is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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