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Keystone
A census-designated place in Colorado. / A city and town in Iowa. / A ghost town in North Dakota. / A town in South Dakota.
Keystoners
Keystoner
(US, military) A member of the 28th Infantry Division (United States).
keystone
(architecture) The top stone of an arch. / Something on which other things depend for support. / A native or resident of the American state of Pennsylvania.
keystone
(transitive) To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.
( present singular third-person )
( participle present )
( participle past )
( past )
keystones
keystoned
keystoned
keystoning
keystone species
(ecology) A species that exerts a large, stabilizing influence throughout an ecological community, despite its relatively small numerical abundance.