One of the mysteries of the English language finally explained.
A device for temporarily enlarging the picture on the cinema screen during a film, using a wide-angle magnifying lens system attached to the projector, and a screen of variable size or position; the process or technique of using this device, an early form of widescreen projection.
1920s; earliest use found in The New York Times. From magn- + -a- connective + -scope.
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