STYX, (anc. geog.), a fountain dropping a deadly water, accounted sacred, between Monacris and Pheneus in Arcadia.—Styx, a lake of Thessaly, from which the river Titarellus ran, (Pliny).—A river of hell, (Homer, Hesiod, Virgil, Ovid); held in such veneration by the gods, that an oath of any god by it was inviolable; and whatever god presumed to break it was stript of divinity, and debarred nectar for 100 years.