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Another word for keystone

      1. A stone at the corner of a building uniting two intersecting walls; a quoin.
      2. Such a stone, often inscribed, laid at a ceremony marking the origin of a building.
      3. An indispensable and fundamental basis:
      1. A chief support:
      2. A strong rope that serves to steady and support the mainmast of a sailing vessel.
      1. An object placed beneath or against a structure to keep it from falling or shaking; a support.
      2. One that serves as a means of support or assistance.
      3. To support by placing something beneath or against; shore up.
      1. a projecting structure, generally of brick or stone, built against a wall to support or reinforce it
      2. anything like a buttress; support or prop
      3. to support or reinforce with a buttress