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

1945–50, Americanism; noun use of verb phrase rain out

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World English Dictionary
rainout (ˈreɪnˌaʊt)
radioactive fallout or atmospheric pollution carried to the earth by rain

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The race has continually been plagued by cold, inclement conditions, including a rainout last season.
And that causes a premature rainout of the cloud, a cloud that would otherwise not precipitate at all.
Rainout games will be made up at end of season if time permits.
It will be lost from the atmosphere mainly by rainout and dry deposition.
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