geothermal
adj. B2 Upper Intermediate US //ˌdʒioʊˈθɝməɫ// UK //dʒˌiːəʊθˈɜːməl// geo·ther·mal
adj. relating to the heat that comes from inside the earth. You usually hear this word when people talk about clean energy or hot springs.
adj. relating to or produced by the internal heat of the earth. Often describes energy sources or geological features like geysers and hot springs.
The city uses geothermal energy to heat homes.
Iceland produces a significant portion of its electricity by tapping into geothermal reservoirs deep underground.
Engineers are exploring enhanced geothermal systems that could potentially harness heat from dry rock layers, significantly expanding the geographic availability of this renewable resource.
From geo- + thermal.
Usage
Typically used attributively before a noun like 'energy', 'power', or 'heating'.