I.the king of the Lower World, the husband of Proserpine, and brother of Jupiter and Neptune, Cic. N. D. 2, 26, 66; Hyg. praef.; Verg. A. 7, 327; Juv. 13, 50.—Acc. Gr. Plutona, Hor. C. 2, 14, 7.—Hence,
II. Plūtōnĭus , a, um, adj., of or belonging to Pluto, Plutonian: “et domus exilis Plutonia,” i. e. the realms. of death, the Lower Regions, Hor. C. 1, 4, 17.—Subst.: Plūtō-nĭa , ōrum, n. plur., a pestilential district in Asia, Cic. Div. 1, 36, 79.