\A*pol"ly*on\, n. [Gr. ? destroying, fr. ?, ?, to
destroy utterly; ? from, entirely + ? to destroy.]
The Destroyer; -- a name used --(Rev. ix. 11) for the angel
of the bottomless pit, answering to the Hebrew Abaddon.
Easton Bible Dictionary
Definition:
destroyer, the name given to the king of the hosts represented by the locusts (Rev. 9:11). It is the Greek translation of the Hebrew Abaddon (q.v.).
Webster's 1913 Dictionary