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Dictionary

  Definition of keystone
  1. the central building block at the top of an arch or vault
  2. a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
Similar Words: key, headstone, anchor, mainstay, backbone, linchpin, lynchpin

 

Hyponyms: quoin, coign, coigne

 

Part Meronyms: arch

 

Derivational Morphology: anchor, ground

 

 
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