Here you will find one or more explanations in English for the word Avernal.
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Avernal
Avernal A*ver"nal, Avernian A*ver"ni*an, a.
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.
Meaning of Avernal from wikipedia