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lunette (n.)

1570s, "semi-circular partial horseshoe," from French lunette (13c.), literally "little moon," diminutive of lune "moon," from Latin luna (see luna). Later applied to a wide range of objects and ornamentations resembling more or less a crescent moon.

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Definitions of lunette from WordNet

lunette (n.)
temporary fortification like a detached bastion;
lunette (n.)
oval or circular opening; to allow light into a dome or vault;
Synonyms: fenestella
From wordnet.princeton.edu