geothermal
adjectiveUK /ˌdʒiːəʊˈθɜːməl/
US /ˌdʒiːoʊˈθɜːrməl/
Geothermal means heat that comes from deep inside the Earth.
The geothermal water from the ground keeps the house warm in winter.
OTHER MEANINGS
2. Relating to the heat produced by the Earth's interior.
Geothermal energy can be used to make electricity.
3. Describing a building or system that uses heat from the ground.
They installed a geothermal heating system to save money.
4. Relating to the study of the Earth's internal heat.
The scientists did geothermal research near the volcano.