Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Generating electricity by conversion of the energy of running water.
  • adjective Of, relating to, or using electricity so generated.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective that generates electricity by converting the energy of moving water
  • adjective of or relating to the electricity so produced

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

hydro- +‎ electric

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