from the GNU version of the Collaborative International Dictionary of English
- adj. Of or pertaining to Avernus, a lake of Campania, in Italy, famous for its poisonous vapors, which ancient writers fancied were so malignant as to kill birds flying over it. It was represented by the poets to be connected with the infernal regions.
from The Century Dictionary and Cyclopedia
- Relating or pertaining to Avernus. See Avernian.
- Destructive of bird life: as, avernal places, Stanley, Hist. Philos. (in allusion to the ancient statement that birds attempting to fly across Lake Avernus were killed by its mephitic vapors. See etymology of Avernian).
- n. A demon or other inhabitant of the infernal regions.
Sorry, no etymologies found.
Gaze well, friends, into that avernal smear, but beware the mind-torturing Gorgon with the sinister snakes.