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geothermal

adjective
 
 
/ˌdʒiː.əʊˈθɜː.məl/ US  /-oʊˈθɝː-/ specialized

Definition

of or connected with the heat inside the Earth: a geothermal power stationHot and heatSultriness and humidityEnergy, force and powerPower and intensity
(Definition of geothermal adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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