serein

[ suh-ran ]
/ səˈræn /

noun Meteorology.

fine rain falling after sunset from a sky in which no clouds are visible.

Origin of serein

1865–70; < French serein, Middle French serain evening, nightfall < Vulgar Latin *sērānum, equivalent to Latin sēr(um) a late hour (neuter of sērus late) + -ānum, neuter of -ānus -an; compare obsolete English serene < Middle French
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British Dictionary definitions for serein

serein

/ (səˈreɪn) /

noun

fine rain falling from a clear sky after sunset, esp in the tropics

Word Origin for serein

C19: via French, from Old French serain dusk, from Latin sērus late
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