Noun
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the central building block at the top of an arch or vault
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keystone,
key |
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building block a block of material used in construction work
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arch (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
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| headstone -
a stone that is used to mark a grave
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gravestone,
tombstone |
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stone building material consisting of a piece of rock hewn in a definite shape for a special purpose; "he wanted a special stone to mark the site"
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memorial,
monument a structure erected to commemorate persons or events
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