GNU Collaborative International Dictionary of English

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1.       
    Hydro- (?), Hydr-. 
   1. A combining form from Gr. , , water (see Hydra).
   
   [1913 Webster]
   
   
   2. (Chem.) A combining form of hydrogen, indicating hydrogen as an ingredient, “as hydrochloric; or a reduction product obtained by hydrogen, as hydroquinone.”
   
   [1913 Webster]