One of the mysteries of the English language finally explained.
Of, relating to, or resembling the mythical fiery river Phlegethon; specifically blazing, burning.
Early 17th century; earliest use found in Cyril Tourneur (d. 1626), writer and soldier. From classical Latin Phlegethont-, Phlegethōn + -ic. Compare post-classical Latin Phlegethonticus.
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