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Armageddon (ahr muh GED duhn)
The word occurs only in the New Testament of the Bible in the Book of Revelation 16:16 as a Greek transliteration of the term claimed to be Hebrew, Mount Megiddo: "And he gathered them together into a place called in the Hebrew tongue Armageddon." (King James Version)

Megiddo, situated at the north end of the major pass through the Mount Carmel range, was the site of many ancient battles.

The archaeological data reinforce the literary portrait in showing frequent extremely heavy defense facilities at the site; therefore, it may have appeared to be an excellent symbol to the apocalyptic writer for the ultimate conflict he saw as the culmination (climax) of history.

—Compiled from information provided by Harper's Bible Dictionary;
General Editor, Paul J. Achtemeier; Harper & Row, Publishers; San Francisco; 1985; page 64.
This entry is located in the following unit: Bible or Biblical Terms Everyone Should Know (page 1)
Word Entries at Word Info: “armageddon
Armageddon, snowmageddon
Armageddon (ahr" muh GED'n) (noun)
1. In the Bible (Revelation 16:16); the scene of a final battle between the forces of good and evil, prophesied to occur at the end of the world: Armageddon represents the location of the final cosmic battle of the forces of good and of evil.

Armageddon is often used to mean simply an "apocalyptic-scale disaster"; for example, news sites refer to "financial Armageddon", "environmental Armageddon", "Toyota Armageddon", etc., where there is no indication of warring parties.

2. A decisive or catastrophic conflict: Efforts are being made by some to avoid the threat of a nuclear Armageddon.
snowmageddon (snoh" muh GED'n) (noun)
An awesome accumulation of snow: Snowmageddon is a hyperbolic exaggeration referring to the "monstrous" snow storms which took place in parts of the United States in the early days of February, 2010.

Mid-Atlantic residents in the U.S. were buried by a likely record-setting blizzard which President Obama jokingly labeled Snowmageddon as well as those who were brave enough to try to clear a path through the wet, heavy mounds, of thigh-high snow.

The Farmers’ Almanac predicted an Armageddon of rain and winds during the summer and a repeat of the snowmageddon which we experienced two winters ago.