rideau

le rideau (FR N-M) curtain, piece of fabric, usually falling in folds, mobile, that serves to block or diffuse light coming through a window, or to hide, shelter, or decorate something; the great curtain in a theater, separating the stage from the auditorium. First appears in French in 1347, from rider (to pleat). (Banville, Eluard, Monnier, Pomey)