The towering roof of heaven.
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.
Any high wall for defense.
A feature jutting prominently out from a mountain or rock.
A brick or stone structure built against another structure to support it.
Anything that supports or strengthens.
A buttress-root.
Anything that serves to support something; a prop.
To support something or someone by supplying evidence.
To support something physically with, or as if with, a prop or buttress.