\Hy`dro-e*lec"tric\, a. [Hydro-, 1 + electric.]
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.