From Longman Dictionary of Contemporary Englishgeothermalge‧o‧ther‧mal /ˌdʒiːəʊˈθɜːməl◂ $ -oʊˈθɜːr-/ adjective relating to or coming from the heat inside the Earth a geothermal energy plant
Examples from the Corpus
geothermal• However, far more use is made of geothermal energy for direct heat.• There is some promise of geothermal energy.• The geothermal modelling package has been used to model the thermal history of two basins in the Far East.• A hydrogeologist and an isotope chemist provided professional advice to the ongoing geothermal resource study.• In iceland for example some 70% of the country's energy needs are met from geothermal sources.• E may ultimately rid itself of other power plants as well, including hydropower and geothermal units. 