拱顶石
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拱顶石又稱拱心石（英語：Keystone），是砖石拱门顶上的楔形石头以及圆形石头。這些石塊是施工过程中最后一块安放的石頭，它主要能将所有的石头固定在位置上。此外人們還會對拱顶石進行装饰[1]。
参考文献
- ^ Windows and More About Arches. [2007-06-25]. （原始内容存档于2018-01-20）.
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