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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.
Origin of hydrothermal
First recorded in 1840-50; hydro-1 + thermal
Related forms
hydrothermally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for hydrothermal


of or relating to the action of water under conditions of high temperature, esp in forming rocks and minerals
Derived Forms
hydrothermally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hydrothermal

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

Online Etymology Dictionary, © 2010 Douglas Harper
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hydrothermal in Science
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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