geothermal

adjective

geo·​ther·​mal ˌjē-ō-ˈthər-məl How to pronounce geothermal (audio)
: of, relating to, or utilizing the heat of the earth's interior
also : produced or permeated by such heat
geothermal steam
geothermal regions
geothermally adverb

Did you know?

Geothermal comes partly from the Greek thermos, "hot". Most geothermal electricity is provided by power plants situated in areas where there is significant activity of the Earth's great tectonic plates—often the same areas where volcanoes are found. But hot water from deep underground may be used by cities far from volcanoes to heat buildings or sidewalks. And a newer source of geothermal energy relies on a less dramatic kind of heat: Individual homeowners can now install heat pumps that take advantage of the 50°-60° temperature of the soil near the surface to provide heating in cold weather (and air-conditioning in the warm months). These very small-scale geothermal systems may eventually supply more useful energy than the large power plants.

Examples of geothermal in a Sentence

Recent Examples on the Web Experiences and Amenities Iceland is known for its lagoons — in fact, its iconic Blue Lagoon was recently named the most relaxing tourist attraction in the world — and Highland Base is well positioned for travelers going to Iceland to soak in its famed geothermal waters. Susmita Baral, Travel + Leisure, 20 May 2024 There is a lot of untapped potential with geothermal Boise's system is only used for heat because the warm water in the geothermal aquifer beneath this city of 230,000 is below the boiling point. Kirk Siegler, NPR, 8 May 2024 See all Example Sentences for geothermal 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'geothermal.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

geo- + thermal entry 1

First Known Use

1875, in the meaning defined above

Time Traveler
The first known use of geothermal was in 1875

Dictionary Entries Near geothermal

Cite this Entry

“Geothermal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/geothermal. Accessed 28 May. 2024.

Kids Definition

geothermal

adjective
geo·​ther·​mal ˌjē-ō-ˈthər-məl How to pronounce geothermal (audio)
variants also geothermic
-mik
: of, relating to, or using the heat of the earth's interior
also : produced by such heat
Last Updated: - Updated example sentences
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