keystone

Noun
  1. A central cohesive source of support and stability (synset 105702197)
    "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
    is a type of: support - something providing immaterial assistance to a person or cause or interest
    same as: anchor, backbone, linchpin, lynchpin, mainstay
  2. 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: headstone, key

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