the day of the Last Judgment, at the end of the world.
any day of judgment or sentence.
nuclear destruction of the world.
given to or marked by forebodings or predictions of impending calamity; especially concerned with or predicting future universal destruction: the doomsday issue of all-out nuclear war.
capable of causing widespread or total destruction: doomsday weapons.

before 1000; Middle English domes dai, Old English dōmesdæg Judgment Day. See doom, day Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doomsday or domesday (ˈduːmzˌdeɪ)
1.  (sometimes capital) the day on which the Last Judgment will occur
2.  any day of reckoning
3.  (modifier) characterized by predictions of disaster: doomsday scenario
[Old English dōmes dæg Judgment Day; related to Old Norse domsdagr]
domesday or domesday
[Old English dōmes dæg Judgment Day; related to Old Norse domsdagr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. domesdæg, from domes, gen. of dom (see doom) + dæg "day." In medieval England it was expected when the world's age reached 6,000 years from creation, which was thought to have been in 5200 B.C. Bede, c.720, complained of being pestered by rustici asking him
how many years till the sixth millennium ended. There is no evidence for a general panic in the year 1000 C.E. Doomsday machine "bomb powerful enough to wipe out human life on earth" is from 1960.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The so-called doomsday algorithm uses clever mental arithmetic and mnemonic
  tricks to enable a quick determination.
Lets keep the gravy train coming and predict some more doomsday scenarios.
These people are trying to work together to create this doomsday weapon.
It will probably be seven more years before the doomsday carp is ready to swim
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