rose-window

n ornamental circular window, usu in a church 圆花窗（通常为教堂中的）.

rooster, root, root beer, root vegetable, root-crop, rooted, rootless, rootlessness, rope, rope ladder, rope-ladder, ropiness, ropy (also ropey), Roquefort, roro, rosary, rose, rose-bud, rose-hip, rose-water, roseate, rosebay, rosebush, rosemary, rosette, rosewood, rosin, rosiness, roster, rostrum, rosy, rot, rot-gut, rota, rotary, rotate, rotation, rotational, rotatory, rote,