lunette

noun

• 1an arched aperture or window, especially one in a domed ceiling.
• a crescent-shaped or semicircular alcove containing something such as a painting or statue.

• 2a fortification with two faces forming a projecting angle, and two flanks.

• 3 Christian Church a holder for the consecrated host in a monstrance.

• 4a broad, shallow, typically crescent-shaped mound of wind-blown material along the leeward side of a lake or dry lake basin.

• 5a ring fixed to a vehicle, by which it can be towed.