Definition of Keistone
Key"stone` (?), n. (Arch.)
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.
- Webster's Unabridged Dictionary (1913)
- (architecture) The top stone of an arch.
- The Nuttall Encyclopedia
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