Meaning of Phlegethon

Phleg•e•thon

Pronunciation: (fleg'u-thon", flej'-), [key]
— n.
  1. Also calleda river of fire, one of five rivers surrounding Hades.
  2. (often l.c.) a stream of fire or fiery light.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.