Hydrothermal


[hahy-druh-thur-muh l] /ˌhaɪ drəˈθɜr məl/

adjective, Geology.
1.
noting or pertaining to the action of hot, aqueous solutions or gases within or on the surface of the earth.
/ˌhaɪdrəʊˈθɜːməl/
adjective
1.
of or relating to the action of water under conditions of high temperature, esp in forming rocks and minerals
adj.

1852, from hydro- + thermal (adj.); 1855 in geology.
hydrothermal
(hī’drə-thûr’məl)
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.

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