chthonic[adjective]Synonyms: infernal, chthonian, Hadean, plutonian, plutonic, sulphurous, Tartarean
 [TahlilGaran] English Synonym Dictionary ▲
 chthonic adjective. 
['kƟɒnɪk] L19.[from Greek khthōn earth + -IC.]Dwelling in or beneath the earth or in the underworld; of or pertaining to the underworld. 
 [TahlilGaran] English Dictionary ▲