拱頂石又稱拱心石（英語：Keystone），是磚石拱門頂上的楔形石頭以及圓形石頭。這些石塊是施工過程中最後一塊安放的石頭，它主要能將所有的石頭固定在位置上。此外人們還會對拱頂石進行裝飾[1]。
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參考文獻
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