headstone

Noun
  1. The central building block at the top of an arch or vault (synset 103620342)
    is a type of: building block - a block of material used in construction work
    subtypes: coign, coigne, quoin - the keystone of an arch
    is a part of: arch - (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
    same as: key, keystone
  2. A stone that is used to mark a grave (synset 103460432)
    is a type of:
    • memorial, monument - a structure erected to commemorate persons or events
    • stone - building material consisting of a piece of rock hewn in a definite shape for a special purpose
    is a part of: grave, tomb - a place for the burial of a corpse (especially beneath the ground and marked by a tombstone)
    same as: gravestone, tombstone

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