(historical)a small room in the thickness of the wall of a fortress, with embrasures from which guns or missiles can be fired (史)(堡垒的)暗炮台 ■an armoured enclosure for guns on a warship 军舰炮塔
语源
mid 16th cent.: from French, from Italian casamatta, perhaps from Greek khasma, khasmat- (see chasm)