Fromrain +‎out.

rainout (countable anduncountable,pluralrainouts)

1. (countable) Something which has beencancelled due tointerferingrain.

   Synonym:washout

2. (countable) Such acancellation.
3. (uncountable)Nuclear fallout deposited by means ofrain.

• 2004, Jon C. Stott,Minor Leagues, Major Boom: Local Professional Baseball Revitalized, page89:

  Arainout on the season's second game would be, to say the least, unconvenient.

• snowout

• Tournai

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