flashing
/ˈflæʃɪŋ/noun
- a strip of metal used to stop water penetrating the junction of a roof with another surface（防止水渗透屋顶和其他表面结合处的）防水板, 遮雨板：
flashings around chimneys
烟囱周围的防水板
mass noun the lead flashing on the roof.屋顶上的防水铅板。
词源
late 18th cent.: from the earlier synonym flash (of unknown origin)+-ING1.