hydrotherapy

From hydro- +‎ therapy.

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hydrotherapy (countable and uncountable, plural hydrotherapies)

1. (alternative medicine) Any of various techniques that use water, either externally or internally, for the treatment of disease and for the soothing of pain.
   • 1961, Harry E. Wedeck, Dictionary of Aphrodisiacs, New York: The Citadel Press, page 156:

     Radio-active baths are said to act favourably in a sexual direction. So too with arsenical springs, cold water treatment, and hydrotherapy.