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