- a river in the underworld, over which the souls of the dead were ferried by Charon, and by which the gods swore their most solemn oaths.
Examples from the Web for styx
Fallon wasn't too shabby himself, performing admirable renditions of Iggy Azalea's "Fancy" and Styx's "Mr. Roboto."Viral Video of the Day: Emma Stone's Lip Sync Battle
The Daily Beast Video
April 29, 2014
Ask any gift of me and it shall be thine; I call the Styx to witness.Old Greek Folk Stories Told Anew
Josephine Preston Peabody
It would be just lovely to be rowed across the Styx together.Cleo The Magnificent
To swear by the Styx was to take "the great oath of the gods."
I was upon the Styx, and in my rower I recognised the redoubtable Charon.The Quadroon
"I am ready to swear by the Styx," said D'Harmental, laughing.The Conspirators
Alexandre Dumas (Pere)
- Greek myth a river in Hades across which Charon ferried the souls of the dead
Word Origin and History for styx
late 14c., the Greek river of the Underworld, cognate with Greek stygos "hatred," stygnos "gloomy." Oaths sworn by it were supremely binding and even the gods feared to break them. The adjective is Stygian.