or ge·o·ther·mic

[ jee-oh-thur-muh l ]
/ ˌdʒi oʊˈθɜr məl /


of or relating to the internal heat of the earth.

Origin of geothermal

First recorded in 1870–75; geo- + thermal Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for geothermal

British Dictionary definitions for geothermal



/ (ˌdʒiːəʊˈθɜːməl) /


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

Science definitions for geothermal

[ jē′ō-thûrməl ]

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.