rideau

curtain (woven fabric to cover, e.g., windows); blind (cover for windows); curtain, veil (something keeping another in secret)

Inherited from Middle French rideau, from Old French ridel (“a curtain", originally, "a plaited stuff”), perhaps from Old High German ridil (“a headband; ribbon”), from Proto-Germanic *wriþilaz, from *wrīþaną (“to twist; wind; wrap”). Alternatively, Old French ridel may derive from rider (“to wrinkle”), from Old High German rīdan (“to wrap; twist; wind; wrinkle”), from the same Proto-Germanic verb above. Cognate with Piedmontese ridò.