noun, Television.
(in mechanical scanning) a disk with a line of holes spiraling in from its edge, rotated in front of a surface so as to expose a small segment as each hole passes before it for transmitting or reproducing a picture.


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    noun 1. a device in which the specimen is examined point by point directly in a moving electron beam, and electrons reflected by the specimen are used to form a magnified, three-dimensional image on a television screen. Abbreviation: SEM. scanning electron microscope noun 1. a type of electron microscope that produces a three-dimensional image scanning […]

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