barbette
/bɑːˈbet/noun
1- a fixed armoured housing at the base of a gun turret on a warship or armoured vehicle（战舰或战车炮塔的）炮座, 炮墩。
1.1
- historical a platform on which a gun is placed to fire over a parapet〈史〉炮台。
词源
late 18th cent.: from French， diminutive of barbe 'beard' （see BARB1）.