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."

Definition of Abaddon:
"the destroyer"