1. a muscle that rotates a body part
Usage: anatomy
2. a machine or device that causes something to rotate

Examples

• The rotator cuff muscles help move your shoulder.
• She injured her rotator cuff playing tennis.
• The rotator cuff consists of four muscles.
• The antenna rotator allows the dish to turn automatically.
• A tire rotator helps ensure even wear on all tires.
• The rotator mechanism broke and needs repair.