A shell-proof vault in a thick wall, having openings through which cannon may be pointed and discharged.

炮廓；城墙内的炮台(厚墙之防弹，可由窗发炮者)。(城堡墙上的)掩蔽部份。

On a warship, an armored enclosure with openings for guns.

战舰上之装甲炮塔。