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keystone
 
Noun keystone has 2 senses
  1. anchor, mainstay, keystone, backbone, linchpin, lynchpin - 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"
    --1 is a kind of support
  2. keystone, key, headstone - the central building block at the top of an arch or vault
    --2 is a kind of building block
    --2 is a part of arch
    --2 has particulars: quoin, coign, coigne
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