WordReference Random House Unabridged Dictionary of American English © 2019
A•bad•don  (ə badn),USA pronunciation n. 
  1. BibleApollyon.
  2. Biblea place of destruction;
    the depths of hell.
  • Hebrew ăbhaddōnōn literally, destruction

Collins Concise English Dictionary © HarperCollins Publishers::
Abaddon /əˈbædən/ n
  1. the Devil (Revelation 9:11)
  2. (in rabbinical literature) a part of Gehenna; Hell
Etymology: Hebrew: literally, destruction
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