Definitions for: Keystone

[n] the central building block at the top of an arch or vault

Webster (1913) Definition: 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.

Synonyms: headstone

See Also: arch, building block, coign, coigne, quoin

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