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rainout

or rain-out

[reyn-out]
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noun
  1. a contest, performance, or the like, that has been rained out.
  2. Also called washout. the removal of radioactive particles or other foreign substances from the atmosphere by precipitation.
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Compare fallout.

Origin of rainout

1945–50, Americanism; noun use of verb phrase rain out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for rainout

rainout

noun
  1. radioactive fallout or atmospheric pollution carried to the earth by rain
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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