'Lunette' definitions:

Definition of 'lunette'

noun

Temporary fortification like a detached bastion

noun

Oval or circular opening; to allow light into a dome or vault [syn: lunette, fenestella]

From: GCIDE

Lunette \Lu*nette"\, n. [F., dim. of lune moon, L. luna. See Lune a crescent.]
1. (Fort.) A fieldwork consisting of two faces, forming a salient angle, and two parallel flanks. See Bastion. [1913 Webster]
2. (Far.) A half horseshoe, which lacks the sponge. [1913 Webster]
3. A kind of watch crystal which is more than ordinarily flattened in the center; also, a species of convexoconcave lens for spectacles. [1913 Webster]
4. A piece of felt to cover the eye of a vicious horse. [1913 Webster]
5. (Arch.) Any surface of semicircular or segmental form; especially, the piece of wall between the curves of a vault and its springing line. [1913 Webster]
6. An iron shoe at the end of the stock of a gun carriage. [1913 Webster]
Lunette window (Arch.), a window which fills or partly fills a lunette. [1913 Webster]