Bible Dictionaries
Apollyon

Hastings' Dictionary of the Bible

APOLLYON (‘the Destroyer’). The Greek equivalent in Revelation 9:11 of Abaddon , the angel of the bottomless pit, who was also the king of the locusts (see Abaddon). The word does not appear in its Greek form in later Rabbinic writings, and only here in the NT. As an angel Apollyon seems to have been regarded as equivalent to Asmodæus, king of demons, in Judaistic mythology; but our data are too few to warrant precise statements.

Shailer Mathews.

Bibliography Information
Hastings, James. Entry for 'Apollyon'. Hastings' Dictionary of the Bible. https://www.studylight.org/​dictionaries/​eng/​hdb/​a/apollyon.html. 1909.