ROTOR
rotor
(noun) rotating mechanism consisting of an assembly of rotating airfoils; “there are horizontal rotors on a helicopter or compressor rotors in a jet engine”
rotor, rotor coil
(noun) the rotating armature of a motor or generator
rotor
(noun) the revolving bar of a distributor
Source: WordNet® 3.1
Etymology
Noun
rotor (plural rotors)
A rotating part of a mechanical device, for example in an electric motor, generator, alternator or pump.
The wing of a helicopter or similar aircraft.
A quantity having magnitude, direction, and position.
Source: Wiktionary
Ro"tor, n. (Elec.)
Definition: The rotating part of a generator or motor.
Source: Webster’s Unabridged Dictionary 1913 Edition