bn:00043350n
Noun Concept
Categories: Architectural elements, Arches and vaults, Ornaments (architecture)
EN
keystone  headstone  key
EN
The central building block at the top of an arch or vault WordNet 3.0
Definitions
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Sources
EN
A keystone is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. Wikipedia
A central stone or other piece at the apex of an arch or vault Wikipedia Disambiguation
Top stone of an arch Wikidata
The top stone of an arch. Wiktionary
WordNet 3.0 & WordNet 2020
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