Etymology
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raster (n.)

"scanning field," 1934 in electrical engineering, from German Raster "screen, frame," from Latin rastrum "rake," from rasum, from rodere "to scrape" (see rodent). Related: Rasterization; rasterize. From Latin form rastellum comes French râteau "rake," formerly ratel, originally rastel.

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Definitions of raster

raster (n.)
the rectangular formation of parallel scanning lines that guide the electron beam on a television screen or a computer monitor;
From wordnet.princeton.edu