Martello
/mɑːˈteləʊ/(亦作Martello tower)
noun
(pl. -os)
- any of numerous small circular forts that were erected for defence purposes along the SE coasts of England during the Napoleonic Wars（拿破仑战争时期沿英国东南海岸为防御目的而筑的）海岸圆堡, 圆形石堡。
词源
alteration （by association with Italian martello 'hammer'） of Cape Mortella in Corsica, where such a tower proved difficult for the English to capture in 1794.