of or pertaining to the internal heat of the earth.
Also, geothermic.

1870–75; geo- + thermal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
geothermal or geothermic (ˌdʒiːəʊˈθɜːməl)
of or relating to the heat in the interior of the earth
geothermic or geothermic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
geothermal   (jē'ō-thûr'məl)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The government wants to contain the crisis in the long run with geothermal
They could also be used in geothermal and nuclear power plants.
So-called geothermal power has been around for more than a century.
Generate energy with solar panels, wind turbines or geothermal systems-or all
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