keystoned
simple past tense and past participle of keystone
keystoned (not comparable)
Having a keystone.
a keystoned arch
Source: Wiktionary
Key"stone`, n. (Arch.)
Definition: 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’s Unabridged Dictionary 1913 Edition
21 February 2025
(noun) some artifact that has been restored or reconstructed; “the restoration looked exactly like the original”
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