lunetten.
英 luː'net | 美 lʊ'nɛt
中文n. （天花板）弦月窗；半月形（物）；（筑城）[军] 眼镜堡
词根词源
lunette (n.)1570s, "semi-circular horseshoe," from Middle 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 a crescent moon.
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