avernal
adjective
aver·nal
əˈvərnᵊl
variants or avernian
-nēən,
-nyən
sometimes capitalized
: infernal
Word History
Etymology
avernal from Latin Avernalis of Avernus, from Avernus, lake near Pozzuoli, Italy (now Lago Averno), reputed because of its depth and stench to lead to the underworld, underworld + Latin -alis -al; avernian from Avernus + English -ian