hydropathy
noun
hy·drop·a·thy hī-ˈdrä-pə-thē 
: a method of treating disease by copious and frequent use of water both externally and internally compare hydrotherapy
hydropathic
ˌhī-drə-ˈpa-thik
adjective 
Example Sentences
Recent Examples on the Web Spas sprang up to serve people seeking the benefits of hydropathy, a treatment involving a copious intake of water. 
Contributing Writer, NOLA.com, 10 Oct. 2017
Contributing Writer, NOLA.com, 10 Oct. 2017 Word History
Etymology
International Scientific Vocabulary
First Known Use
1843, in the meaning defined above
Medical Definition
hydropathy
noun
hy·drop·a·thy hī-ˈdräp-ə-thē
plural hydropathies
: a method of treating disease by copious and frequent use of water both externally and internally compare hydrotherapy