geothermal Syllabification: (ge·o·ther·mal)Pronunciation: /ˌjēōˈTHərməl/ (also geothermic /-ˈTHərmik/)Definition of geothermal adjective of, relating to, or produced by the internal heat of the earth:some 70% of Iceland’s energy needs are met from geothermal sourcesgeothermal in other Oxford dictionaries Definition of geothermal in the British & World English dictionary
