hydroelectric Syllabification: (hy·dro·e·lec·tric)Pronunciation: /ˌhīdrōəˈlektrik/Translate hydroelectric | into German | into Italian | into Spanish Definition of hydroelectric adjective relating to or denoting the generation of electricity using flowing water (typically from a reservoir held behind a dam or other barrier) to drive a turbine that powers a generator. Derivatives hydroelectricityPronunciation: /-əlekˈtrisitē/ noun hydroelectric in other Oxford dictionaries Definition of hydroelectric in the British & World English dictionary