1 Head of any part of a building, especially of an arch or vault (including the keystone and about the middle third of the arc), called crown of an arch, and embracing both intrados and extrados.
2 Apse at the east end of a church.
3 Decorative termination in which a spire is replaced by four flying buttresses rising from pinnacles at the corners of a tower, meeting in the middle and supporting a slender spirelet that rests entirely upon the buttresses: good examples are at St Giles Cathedral, Edinburgh (c.1486), St Nicholas, Newcastle upon Tyne (c.1475), and St Dunstan-in-the-East, London (1697—based on a medieval precedent at St Mary-le-Bow, London (destroyed) ).
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