cowl
/kaul; kaʊl/ n
1 large hood on a monk's gown （修士道袍上的）大兜帽.
2 cap for a chimney, ventilating pipe, etc, usu of metal and often revolving with the wind, which is designed to improve the flow of air or smoke 通风帽; 烟囱. =>illus at App 1 见附录1之插图, page vii.