Definition of hydrotherapy noun from the Oxford Advanced Learner's Dictionary

 

hydrotherapy

 noun
noun
BrE BrE//ˌhaɪdrəʊˈθerəpi//
 
; NAmE NAmE//ˌhaɪdroʊˈθerəpi//
 
[uncountable]
 
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the treatment of disease or injury by doing physical exercises in water Word Origin late 19th cent.: from hydro- + therapy.
See the Oxford Advanced American Dictionary entry: hydrotherapy