Bible Dictionaries
Keystone
Webster's Dictionary
(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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Bibliography Information
Webster, Noah. Entry for 'Keystone'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/k/keystone.html. 1828.