Definition of capstone in English:


Line breaks: cap|stone
Pronunciation: /ˈkapstəʊn


  • 1A stone fixed on top of something, typically a wall: figurative our time might be merely the capstone to the age of humankind
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    • ‘That's chalcedony,’ Corissa remarked, her eyes focusing on the translucent gray capstones of the wall.
    • It looks fine although the wall capstones could do with painting.
    • A capstone is the uppermost stone of a structure in architecture.
  • 1.1 Archaeology A large flat stone forming a roof over the chamber of a megalithic tomb.
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    • At the same time, a cruciform chamber roofed with large capstones was constructed at the wider, higher end of the enlarged mound.
    • The largest block recorded is the capstone of the tomb at Browneshill, County Carlow, Ireland, estimated to weigh 100 tonnes.
    • Portal tombs are so called from the two large upright stones forming the entrance to the burial chamber; a capstone is set over these and slopes backwards to rest on backstones.

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