Borrowed from French rideau ("curtain"), from Middle French rideau, from Old French ridel ("plaited stuff; cloth curtain; blind#Noun"), from rider, perhaps from Old High German ridil ("a [[headband; a ribbon") or rīdan, wrīdan (related to English writhe), from Proto-Germanic *wriþilaz, from *wrīþaną. See more at riddle, writhe.
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