/ Dictionary / Index P Phlegethon: Meaning and Definition of Find definitions for: Phleg•e•thon Pronunciation: (fleg'u-thon", flej'-), [key] — n. Also calleda river of fire, one of five rivers surrounding Hades. (often l.c.) a stream of fire or fiery light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phlebotomy phlegm Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language