Abaddon

destruction, the Hebrew name (equivalent to the Greek Apollyon,
i.e., destroyer) of "the angel of the bottomless pit" (Rev.
9:11). It is rendered "destruction" in Job 28:22; 31:12; 26:6;
Prov. 15:11; 27:20. In the last three of these passages the
Revised Version retains the word "Abaddon." We may regard this
word as a personification of the idea of destruction, or as
sheol, the realm of the dead.