a low wall along the edge of a bridge, a roof, etc. to stop people from falling 防护矮墙 A low parapet ran all around the flat roof. 平屋顶周围有一道矮墙。
a wall or barrier placed in order to protect soldiers from being shot 防护矮墙
Word Originlate 16th cent.: from French, or from Italian parapetto ‘chest-high wall’, from para- ‘protecting’ + petto ‘chest’ (from Latin pectus).