What's the difference between fenestella and lunette?

Fenestella

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Definition:

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Lunette

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Definition:

• (n.) A fieldwork consisting of two faces, forming a salient angle, and two parallel flanks. See Bastion.
• (n.) A half horseshoe, which wants the sponge.
• (n.) A kind of watch crystal which is more than ordinarily flattened in the center; also, a species of convexoconcave lens for spectacles.
• (n.) A piece of felt to cover the eye of a vicious horse.
• (n.) Any surface of semicircular or segmental form; especially, the piece of wall between the curves of a vault and its springing line.
• (n.) An iron shoe at the end of the stock of a gun carriage.

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