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rotor (n.)

1873, irregular shortening of rotator (see rotate (v.)), originally in mathematics. Mechanical sense is attested from 1903; specifically of helicopters from 1930.

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Definitions of rotor from WordNet

rotor (n.)
the rotating armature of a motor or generator;
Synonyms: rotor coil
rotor (n.)
the revolving bar of a distributor;
rotor (n.)
rotating mechanism consisting of an assembly of rotating airfoils;
there are horizontal rotors on a helicopter or compressor rotors in a jet engine
From wordnet.princeton.edu