Armageddon

google

ref

Greek, from Hebrew har mĕgiddōn ‘hill of Megiddo’ (Rev. 16:16).

wiktionary

ref

Generalization of Armageddon.

etymonline

ref

Armageddon (n.)

"cataclysmic final conflict," 1811, figurative use of the place-name in Revelation xvi.16, site of the great and final conflict, from Hebrew Har Megiddon "Mount of Megiddo," a city in central Palestine, site of important Israelite battles.