Definition of raster
: a scan pattern (as of the electron beam in a cathode-ray tube) in which an area is scanned from side to side in lines from top to bottom
also
: a pattern of closely spaced rows of dots that form an image (as on the cathode-ray tube of a television or computer display)
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Merriam-Webster unabridged
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Time Traveler for raster
The first known use of raster was in 1934
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