Definition of "rotator" [ro•ta•tor]

• One that rotates. (noun)
• Anatomy A muscle that serves to rotate a part of the body. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "When people hear the term rotator cuff they think of surgery."
• "The thing that makes it different that the built-in windows rotator is that it rotates the orientation of the touchpad as well."
• "Whether you've been relatively inactive or fairly athletic, age is the enemy of one of the most important sets of muscles in the body: the group of four known as the rotator cuff that surround the ball of the shoulder joint."