lunette

A small, circular or crescent-shaped opening in a vaulted roof.

A crescent-shaped or semicircular space, usually over a door or window, that may contain another window, a sculpture, or a mural.

A fortification that has two projecting faces and two parallel flanks.

A broad, low-lying, typically crescent-shaped mound of sandy or loamy matter that is formed by the wind, especially along the windward side of a lake basin.

The circular hole in a guillotine in which the neck of the condemned rests.

In fortification, a detached work with flanks, presenting a salient angle to the enemy, intended for the protection of avenues, bridges, and the curtains of fieldworks.

In farriery, a halfhorseshoe, having only the front.

A blinder for the eye of a horse.

In architecture