Origin: Greek prefix geo-
Geothermal has 2 different meanings across 1 category:
of or relating to the heat in the interior of the earth
"The new power plant harnesses geothermal energy by drilling deep into the ground to tap into the Earth's internal heat."
pertaining to heat energy extracted from reservoirs in the earth's interior
"The new power plant relies on geothermal technology to generate electricity by tapping into hot water reservoirs deep beneath the Earth's surface."