barbette

n. 炮座, 露天炮塔

bar.bette

n.（名词）
A platform or mound of earth within a fort from which guns are fired over the parapet.
炮墩，炮座：堡垒内部的平台或土墩，大炮可从中越过胸墙而发射
An armored protective cylinder around a revolving gun turret on a warship.
军舰上的露天炮塔：军舰上旋转炮塔四周的保护性装甲圆柱体

来源：
French [diminutive of] barbe [beard] * see barb
法语 [] barbe的小后缀 [须] *参见 barb