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https://www.merriam-webster.com/dictionary/clavel
" Middle French clavel keystone of an arch, from Latin clavis key "

A keystone (or 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.

Clavell jest dosłownie podporą