adjective Geology.
noting or pertaining to the action of hot, aqueous solutions or gases within or on the surface of the earth.

1840–50; hydro-1 + thermal

hydrothermally, adverb
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World English Dictionary
hydrothermal (ˌhaɪdrəʊˈθɜːməl)
of or relating to the action of water under conditions of high temperature, esp in forming rocks and minerals

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American Heritage
Science Dictionary
hydrothermal   (hī'drə-thûr'məl)  Pronunciation Key 
Relating to or produced by hot water, especially water heated underground by the Earth's internal heat. ◇ Hydrothermal energy is power that is generated using the Earth's hot water.
The American Heritage® Science Dictionary
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