'Rotor' definitions:

Definition of 'rotor'

From: WordNet
noun
The rotating armature of a motor or generator [syn: rotor, rotor coil] [ant: stator, stator coil]
noun
The revolving bar of a distributor
noun
Rotating mechanism consisting of an assembly of rotating airfoils; "there are horizontal rotors on a helicopter or compressor rotors in a jet engine"

Definition of 'Rotor'

From: GCIDE
  • Rotor \Ro"tor\, n. (Elec.) The rotating part of a generator or motor. Contrasted with stator, the stationary part. [Webster 1913 Suppl. +PJC]