拱顶石又称拱心石(英语:Keystone),是砖石门顶上的楔形石头以及圆形石头。这些石块是施工过程中最后一块安放的石头,它主要能将所有的石头固定在位置上。此外人们还会对拱顶石进行装饰[1]

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拱顶石(以红色显示)

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