From Longman Dictionary of Contemporary Englishhydro-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 hydrocarbonsOrigin hydro- Old French Latin, from Greek, from hydor “water”
