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From Longman Dictionary of Contemporary English
Related topics: Elements
hydro-hydro- /haɪdrəʊ, -drə $ -droʊ, -drə/ prefix 1 LIQUIDrelating to water, or using water hydroelectricity (=produced by water power) hydrotherapy (=treatment of disease using water)2 HCErelating to hydrogen, or containing it hydrocarbons
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