Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
geothermic is an adjective meaning "of or relating to the heat in the interior of the earth". It carries one recorded sense.
of or relating to the heat in the interior of the earth
Definitions, synonyms and semantic relations for geothermic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.