Here you will find one or more explanations in English for the word Rheocrat.
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Rheocrat
Rheocrat Rhe"o*crat, n. [Gr. "rei^n to flow + kratei^n to
rule.] (Elec.)
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.
Meaning of Rheocrat from wikipedia