chthon·ic \ˈthänik\adjective orchtho·ni·an\ˈthōnēən\ Etymology:chthonic from Greek chthon-, chthōn earth + English -ic; chthonian from Greek chthonios in or under the earth (from chthon-, chthōn) + English -an — more at humble 1.of a divinity or a spirit: dwelling or reigning in the underworld : infernal < Pluto was the chthonic counterpart of Zeus > 2.: relating to infernal deities or spirits : ghostly < chthonic worship >