Serein

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serein

The doubtful phenomenon of fine rain falling from an apparently clear sky, the clouds, if any, being too thin to be visible.

Frequently fine rain is observed with a clear sky overhead, but clouds to windward clearly indicate the source of the drops. Also, it has been defined as fine rain falling from a clear sky after sunset, probably actually referring to dew, a survival of the old belief that dew falls.

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