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What's the architectural term for the center stone at the top of an arch?

Answer:

Keystone

A keystone (also known as capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to bear weight.

Casual Added August 19th, 2019 by Devis Profile Picture Devis

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