See Abbot.
Digital Bible Dictionary, Grupo C Service & Design Ltda., Colombia, 2003
Source: Digital Bible Dictionary
Greek word apollyon, from apolyo, to destroy. This is how a fallen angel is designated in Rev 9:11 who is the leader of the locust-like beings who bring judgment on the earth. Some think that this term supposes an irony, being derived from the name of Apollo. The Hebrew name, Abaddon, also means ‘destruction’.
Source: Christian Bible Dictionary
(Destroyer).
Greek term used by the apostle John at Revelation 9:11 to translate the Hebrew “Abaddon.” It means “Destroyer”, and is the name given to the “angel of the abyss”. Although most reference works attribute this name to an evil force or character, the whole context of the apocalyptic vision contradicts this opinion, since it consistently refers to angels that God uses to bring woe to his enemies.
This is demonstrated by the use of the verbal form a·pol·ly·mi at James 4:12, for there it is said of God: “There is only one that is lawgiver and judge, the one that is able to save and destroy.” (Compare Mt 10:28.) The unclean spirit that Jesus expelled from a man in the Capernaum synagogue recognized him as a divine agent, saying: “What have we to do with you, Jesus of Nazareth? Did you come to destroy us?† . (Mr 1:24; Lu 4:34) Furthermore, Jesus warned unrepentant opponents who listened to him of the danger of being destroyed. (Lu 13:3-5; 20:16) These and other scriptures show that the glorified Jesus Christ is the one referred to by this title. (Compare Rev 19:11-16; Lu 8:31; see ABADÍ“N.)
Source: Dictionary of the Bible