headstone
1. the central building block at the top of an arch or vault • Syn: keystone, key • Hypernyms: building block • Hyponyms: quoin, coign, coigne • Part Holonyms: arch 2. a stone that is used to mark a grave • Syn: gravestone, tombstone • Hypernyms: stone, memorial, monument • Part Holonyms: grave, tomb
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