I.a river in the Lower World, which ran with fire instead of water: “Chaos et Phlegethon loca nocte silentia late,” Verg. A. 6, 265: “Tartareus,” id. ib. 6, 551; Stat. Th. 4, 522: “ardenti freto Phlegethon harenas igneus tostas agens,” Sen. Thyest. 1018; id. Oedip. 162; id. Agam. 752. —Hence,
Phlĕgĕthon , ontis, m., = Φλεγέθων (burning, blazing),