bn:00043350n
Noun Concept
Categories: Architectural elements, Arches and vaults, Ornaments (architecture)
EN
keystone  key  headstone  capstone  Head cornerstone
EN
The central building block at the top of an arch or vault WordNet 3.0
English:
architecture
Definitions
Relations
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
Architectural element: wedge-shaped stone of an arch Wikidata
The top stone of an arch. Wiktionary
WordNet 3.0 & Open English WordNet
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Wiktionary
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Wikidata Alias