scanning disk
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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Origin of scanning disk
First recorded in 1925–30
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019