[ hwahyt-out, wahyt- ]
/ ˈʰwaɪtˌaʊt, ˈwaɪt- /
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  1. a condition, found in polar regions, in which uniform illumination from snow on the ground and from a low cloud layer makes features of the landscape indistinguishable.
  2. a condition of heavily falling or blowing snow in which visibility is very poor.
an act or instance of whiting out with a correction fluid.
a white correction fluid used for this: a bottle of whiteout.
a mistake, as in typing, that has been whited out with a correction fluid.
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Origin of whiteout

1940–45; (defs. 2-4) noun use of verb phrase white out;(def. 1) white + (black)out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use whiteout in a sentence

British Dictionary definitions for whiteout

white out

verb (adverb)
(intr) to lose or lack daylight visibility owing to snow or fog
(tr) to create or leave white spaces in (printed or other matter)
(tr) to delete (typewritten words or characters) with a white correcting fluid
noun whiteout
an atmospheric condition consisting of loss of visibility and sense of distance and direction due to a uniform whiteness of a heavy cloud cover and snow-covered ground, which reflects almost all the light it receives
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