Phlegethon

noun
Phleg·​e·​thon | \ ˈfle-gə-ˌthän How to pronounce Phlegethon (audio) \

Definition of Phlegethon

: a river of fire in Hades

First Known Use of Phlegethon

14th century, in the meaning defined above

History and Etymology for Phlegethon

Latin, from Greek Phlegethōn

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