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

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

1852, from hydro- + thermal (adj.); 1855 in geology.
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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