geothermal
adjective/ˌdʒiːəʊˈθɜːml/
/ˌdʒiːəʊˈθɜːrml/
(geology)- connected with the natural heat of rock deep in the ground
- geothermal energy
- a geothermal heat pump
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geothermal
Definition of geothermal adjective from the Oxford Advanced Learner's Dictionary