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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Other scientists still think that first step happened at the mouths of
  so-called hydrothermal vents, at the bottom of the sea.
Hydrothermal vents are geysers located on the ocean floor in the deep sea.
The hydrothermal model, on the other hand, says the hot spring fluids deposited
  the gold inside the rocks.
They've adapted to thrive at the edge of hydrothermal vents, which spew
  superheated water saturated with toxic chemicals.
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