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n. Greek Mythology
A river of fire, one of the five rivers of Hades.
[Middle English Flegeton, from Latin Phlegethōn, from Greek, from present participle of phlegethein, to blaze, variant of phlegein; see bhel-1 in the Appendix of Indo-European roots.]
(Classical Myth & Legend) Greek myth a river of fire in Hades
[C14: from Greek, literally: blazing, from phlegethein to flame, blaze]
Phleg•e•thon(ˈflɛg əˌθɒn, ˈflɛdʒ-)
1. a river of fire in the ancient Greek underworld.
2. (often l.c.) a stream of fire or fiery light.
[< Latin < Greek, n. use of phlegéthōn blazing, present participle of phlegéthein to blaze. compare phlegm]
Phleg`e•thon′tal, Phleg`e•thon′tic, adj.