Any high wall for defense.
In fortification: an indented parapet, formed by a series of rising members called cops or merlons, separated by openings called crenelles or embrasures, the soldier sheltering himself behind the merlon while he fires through the embrasure or through a loophole in the battlement.
The towering roof of heaven.
A defensive structure; a protective barrier; a bulwark.
A defensive mound of earth or a wall with a broad top and usually a stone parapet; a wall-like ridge of earth, stones or debris; an embankment for defensive purpose.
That which defends against intrusion from outside; a protection.
A steep bank of a river or gorge.
To defend with a rampart; fortify or surround with a rampart.