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geothermal

[jee-oh-thur-muh l] /ˌdʒi oʊˈθɜr məl/
adjective
1.
of or pertaining to the internal heat of the earth.
Also, geothermic.
Origin
1870-1875
1870-75; geo- + thermal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for geothermic

geothermal

/ˌdʒiːəʊˈθɜːməl/
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
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Word Origin and History for geothermic

geothermal

adj.

1875, from geo- + thermal.

Online Etymology Dictionary, © 2010 Douglas Harper
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geothermic in Science
geothermal
  (jē'ō-thûr'məl)   
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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