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doomsday

[doomz-dey]
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noun
  1. the day of the Last Judgment, at the end of the world.
  2. any day of judgment or sentence.
  3. nuclear destruction of the world.
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adjective
  1. 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.
  2. capable of causing widespread or total destruction: doomsday weapons.
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Origin of doomsday

before 1000; Middle English domes dai, Old English dōmesdæg Judgment Day. See doom, day
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for doomsday

doomsday

domesday

noun
  1. (sometimes capital) the day on which the Last Judgment will occur
  2. any day of reckoning
  3. (modifier) characterized by predictions of disasterdoomsday scenario
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Word Origin

Old English dōmes dæg Judgment Day; related to Old Norse domsdagr
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for doomsday

Doomsday

n.

Old English domes dæg, from domes, genitive of dom (see doom (n.)) + dæg "day" (see day (n.)).

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.

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Online Etymology Dictionary, © 2010 Douglas Harper