apollyon

from The Collaborative International Dictionary of English v.0.48

Apollyon \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.
   [1913 Webster]

from Easton's 1897 Bible Dictionary

Apollyon
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.).

from Hitchcock's Bible Names Dictionary (late 1800's)

Apollyon, a destroyer

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