- 1. n. The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch. Source: opted
- 2. n. a central cohesive source of support and stability Source: wordnet
- 3. n. the central building block at the top of an arch or vault Source: wordnet
- 4. The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch. Keystone State, the State of Pennsylvania; -- so called from its having been the central State of the Union at the formation of the Constitution. Source: webster
- 5. The central or topmost stone of an arch. This in some styles ismade different in size from the other voussoirs, or projects, or isdecorated with carving. See Illust. of Arch. Keystone State, theState of Pennsylvania; -- so called from its having been the centralState of the Union at the formation of the Constitution. Source: adambom
- 6. n:100 n. the central building block at the top of an arch or vault Source: ecdict
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