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 wall of wooden stakes, used as a defensive barrier.
An even row of cells. e.g.: palisade mesophyll cells.
A line of cliffs, especially one showing basaltic columns.
A long, strong stake, one end of which is set firmly in the ground, and the other sharpened.
To equip with a palisade.