Definition of hydro- combining form from the Oxford Advanced American Dictionary

     

    hydro-

     combining form
    combining form
    NAmE//ˈhaɪdroʊ//
     
    , NAmE//ˈhaɪdrə//
     
     
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  1. 1(in nouns, adjectives, and adverbs)
  2. 2connected with water hydroelectricity
  3. 3(chemistry) combined with hydrogen hydrochloric acid

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