Ἀβαδδών

English (Abbott-Smith)

Ἀβαδδών (Heb. אֲבַדֹּון,
destruction; LXX, ἀπώλεια, only in Wisdom Lit., of the place of the ruined dead: Jb 26:6, 28:22, 31:12, Ps 88:12, Pr 15:11*), indecl.; in NT, Abaddon, the angel of the Abyss: Re 9:11.†

English (Strong)

of Hebrew origin (אֲבַדּוֹן); a destroying angel: Abaddon.

English (Thayer)

indeclinable, אֲבַדּון,
1. ruin, destruction (from אָבַד to perish), the place of destruction equivalent to Orcus, joined with שְׁאול, Ἀπολλύων Destroyer, Revelation 11:11.