Phlegethontal
adjective
Phleg·e·thon·tal
¦flegə¦thäntᵊl,
-ejə¦-
variants or Phlegethontic
-tik
archaic
: of, relating to, or resembling a river of fire : burning
Word History
Etymology
Latin phlegethontis phlegethontal (from Phlegethon, principal river of Hades that ran with fire instead of water, from Greek Phlegethōn, from phlegethein to blaze, from phlegein to burn) + English -al or -ic