Jisho

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Noun
1. voussoir; arch-stone; ring stone
Wikipedia definition
2. VoussoirA voussoir (pronounced /vuˈswɑr/) is a wedge-shaped element, typically a stone, used in building an arch or vault. Although each unit in an arch or vault is a voussoir, two units are of distinct functional importance: the keystone and the springer. The keystone is the center stone or masonry unit at the apex of an arch. (It is often decorated or enlarged.
Read “Voussoir” on English Wikipedia
Read “迫石” on Japanese Wikipedia
Read “Voussoir” on DBpedia

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