What does rotator mean?
A rotator is something that turns, rotates, or causes rotation. The term can refer to a mechanical component or device, but its best-known use is anatomical: the shoulder’s rotator cuff consists of several muscles and tendons that stabilize the shoulder joint and rotate the upper arm. In engineering and industrial settings, a rotator may be a powered mechanism that turns a display, conveyor, camera, ventilation system, or other object. The word is used in both British and American English and is more general than “rotor,” which usually names a rotating part within a machine. Although “rotator” can describe a person who rotates something, such as a player changing positions, its common modern uses are technical and medical.
nounA device, component, or person that rotates or causes something to turn. In anatomy, a rotator is a muscle that rotates a body part, especially one of the muscles of the shoulder.
- A device or component that rotates or causes rotation.
- A muscle that rotates a body part, especially one of the shoulder muscles forming part of the rotator cuff.
"The technician oiled the rotator to keep the mechanism turning smoothly."
"The heating system uses a slow rotator to distribute the warm air evenly."
"The rotator cuff helped the pitcher maintain control of the ball."
The plural is used for multiple rotating devices, people who perform rotation duties, or individual rotator muscles.
"The shoulder rotators help maintain stability throughout the movement."
Your shoulder’s rotator cuff works like a stabilizing team, keeping the humeral ball centered while you reach, lift, and throw.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does rotator come from?
The English word “rotator” was formed from “rotate” with the suffix “-or,” denoting an agent or device that performs an action. In turn, “rotate” comes through Latin rotare, “to turn,” from rota, the Latin word for “wheel.” This ancestry also underlies related English words such as “rotation,” “rotary,” and “rotative,” as well as cognates in other Romance languages.
How rotator is actually used
The word is most common in technical and anatomical contexts. It is more general than “rotor,” since it can denote a person or mechanism responsible for rotation as well as a rotating component.
Easily confused with rotator
A rotator is a person, device, or component that performs or causes rotation, whereas a rotor is specifically a rotating part, especially in a machine.