keystoned
/ˈkiːstəʊnd/adjective
1Constructed or fitted with a keystone.
2 Cinematography, Television, and Photography. Of an image: showing the keystone effect; distorted by keystoning.
3 Electrical Engin. Of a cable: having constituent strands made with flattened sides so that they fit together better inside the cable.
Origin
Mid 19th century; earliest use found in The Gentleman's Magazine. From keystone + -ed.