rotor

1. A rotating part of a mechanical device; for example, in an electric motor, generator, alternator, or pump.
2. In a disc brake, the metal disc attached to the wheel hub.
3. The wing of a helicopter or other rotary wing aircraft (e.g., heli-type drone).
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.
6. The set of cells within an oscillator that switch between being alive and dead over the course of the oscillator's period.
7. An amusement park and carnival ride consisting of a rotating cylindrical chamber in which centrifugal force adheres riders to the wall as the floor drops away, creating a sensation of defying gravity.

Plural rotors