pertaining to the generation and distribution of electricity derived from the energy of falling water or any other hydraulic source.

1825–35; hydro-1 + electric

hydroelectricity [hahy-droh-i-lek-tris-i-tee, -ee-lek-] , noun
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World English Dictionary
hydroelectric (ˌhaɪdrəʊɪˈlɛktrɪk)
1.  generated by the pressure of falling water: hydroelectric power
2.  of or concerned with the generation of electricity by water pressure: a hydroelectric scheme

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Dictionary.com's 21st Century Lexicon
Main Entry:  hydroelectricity
Part of Speech:  n
Definition:  See hydroelectric power
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Word Origin & History

1827, formed in Eng. from hydro-, comb. form of Gk. hydor "water" (see water (n.1)) + electric.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
hydroelectric   (hī'drō-ĭ-lěk'trĭk)  Pronunciation Key 

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Using the power of water currents to generate electric power. Generally, hydroelectric power is created by directing water flow through a turbine, where the water causes fans to turn, creating the torque needed to drive an electric generator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Today hydroelectricity is still an important source of energy.
Imagine upstate cellulose and hydroelectricity fueling cars and trucks
  throughout the state.
These dams generate hydroelectricity, or electricity powered by water.
And extensive dam building to produce hydroelectricity has displaced whole
  villages and towns.
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