Rheocrat
Pronunciation : Rhe"o*crat
Part of Speech : n.
Definition : Defn: A kind of motor speed controller permitting of very gradual variation in speed and of reverse. It is especially suitable for use with motor driven machine tools.
[Gr. "rei^n to flow + kratei^n to rule.] (Elec.)
Source : Webster's Unabridged Dictionary, 1913