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geothermal

or ge·o·ther·mic

[jee-oh-thur-muh l]
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adjective
  1. of or relating to the internal heat of the earth.

Origin of geothermal

First recorded in 1870–75; geo- + thermal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for geothermal

geothermal

geothermic

adjective
  1. of or relating to the heat in the interior of the earth
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

Word Origin and History for geothermal

adj.

1875, from geo- + thermal.

Online Etymology Dictionary, © 2010 Douglas Harper

geothermal in Science

geothermal

[jē′ō-thûrməl]
  1. Relating to the internal heat of the Earth. The water of hot springs and geysers is heated by geothermal sources.Geothermal energy is power generated from natural steam, hot water, hot rocks, or lava in the Earth's crust. In general, geothermal power is produced by pumping water into cracks in the Earth's crust and then conveying the heated water or steam back to the surface so that its heat can be extracted through a heat exchanger, or its pressure can be used to drive turbines.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.