Rotor

Noun

1. A rotating part of a mechanical device; for example, in an electric motor, generator, alternator, or pump. .mw-parser-output .defdate{font-size:smaller} In a disc brake, the metal disc attached to the wheel hub. The wing of a helicopter or other rotary-wing aircraft.
2. In a disc brake, the metal disc attached to the wheel hub.
3. The wing of a helicopter or other rotary-wing aircraft.
4. A type of powerful horizontal-axis atmospheric vortex generated by the interaction of strong winds with mountainous terrain.
5. A quantity having magnitude, direction, and position.