Definitions

1. noun

relating to or derived from the heat of the earth

“The geothermal power plant is a great example of renewable energy.”

2. adjective

relating to or derived from the heat of the earth

“The geothermal activity in the region is a concern for the local residents.”

3. adverb

in or relating to the heat of the earth

“The geothermal heating system is efficient and environmentally friendly.”