Dictionary![]() ![]() rain•outPronunciation: (rān'out"), [key] —n. 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. Also,rain'-out".Cf. fallout. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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