lunette

noun [专属名词]（天花板）弦月窗；半月形（物）；（筑城）[军] 眼镜堡

The decoration of the lunette in its vault are the only examples of this type found so far in the Thracian lands.
拱顶的新月形圆顶装饰是迄今为止在色雷斯土地上发现的唯一的这种类型的例子。