καταχθόν-ιος · katachthon-ios — LSJ
subterranean, Ζεὺς καταχθόνιος, i.e. Pluto, Il. 9.457 (but Ζεὺς κ., = Veiouis, D.H. 2.10); of Pluto, Demeter, Persephone, and the Erinyes, IG 3.1423; δαίμονες κ. Hierocl. in CA i p.419 M.; = Lat. Di Manes, AP 7.333; κ. θεοί, = Lat. Di Manes, freq. in sepulchral Inscrr., IG 14.1660, al.