English definition of Keystone

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Definition of keystone

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Keystone (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..

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Crossette :: Crossette (n.) The shoulder of a joggled keystone.

Key :: Key (n.) A keystone.

Mask :: Mask (n.) A grotesque head or face, used to adorn keystones and other prominent parts, to spout water in fountains, and the like; -- called also mascaron..

Keystone :: Keystone (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..

Sagitta :: Sagitta (n.) The keystone of an arch.