Definition of hydr(o)- combining form from the Oxford Advanced Learner's Dictionary

     

    hydr(o)-

     combining form
    combining form
    BrE BrE//ˈhaɪdrəʊ//
     
    ; NAmE NAmE//ˈhaɪdroʊ//
     
    (in nouns, adjectives and adverbs)
     
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  1. 1connected with water hydroelectricity
  2. 2(chemistry) combined with hydrogen hydrochloric acid
  3. Word Originfrom Greek hudōr ‘water’.