Dictionary entry

Ἁρμαγεδών

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

Ἁρμαγεδών (WH, Ἃρ Μαγεδών; Rec. Ἀρμαγεδδών, prop. = הַרמְגִדּוֹ), cf. LXX, Μαγεδών, II Ch 35:22, Μαγεδώ, Jg 1:27;

Har-Magedon (AV, Armageddon): Re 16:16 (v. Swete, in l., but also Thayer, s.v.).†