Hy·dro-e·lec·tric a. Pertaining to, employed in, or produced by, the evolution of electricity by means of a battery in which water or steam is used.
Hydro-electric machine Physics, an apparatus invented by Sir William Armstrong of England for generating electricity by the escape of high-pressure steam from a series of jets connected with a strong boiler, in which the steam is produced.
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hydroelectric
adj : of or relating to or used in the production of electricity
by waterpower; "hydroelectric power"