Wikipedia
Wing wall
A wing wall (also "wingwall" or "wing-wall") is a smaller wall attached or next to a larger wall or structure.
Usage examples of "wing wall".
McLeod muttered, rearing up from cover to fire off a quick burst - three-and-three, in imitation of the troopers - in the direction of a gap in the west wing wall.
The driver slowed, to inch past the half-dozen yellow-suited workmen, digging a deep excavation next to the east wing wall of the palace, and muttered a curse under his breath.
Saying a swift Hail Mary, D'Cey dodged around the short wing wall, crossbow in hand, the boar spear held in the crook of an elbow.