Abbott-Smith Manual Greek Lexicon
κατα-χθόνιος (G2709)
1 * κατα-χθόνιος , -ον ( χθών , the earth ), subterranean , under the earth (in cl., of the infernal gods): of the departed in Hades, opp. to ἐπουράνιος , ἐπίγειος , Phl 2:10 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain