raster

[ ras-ter ]
/ ˈræs tər /

noun

Television. a pattern of scanning lines covering the area upon which the image is projected in the cathode-ray tube or liquid crystal display of a television set or other screen.
Digital Technology. a set of horizontal lines composed of individual pixels, used to form an image on a screen or in matrix printing.

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Origin of raster

First recorded in 1950–55; from German, from Latin rāstrum “toothed hoe, rake,” derivative of rādere “to scratch, scrape”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for raster

raster
/ (ˈræstə) /

noun

a pattern of horizontal scanning lines traced by an electron beam, esp on a television screen

verb

to use web-based technology to turn a digital image into a large picture composed of a grid of black and white dots

Word Origin for raster

C20: via German from Latin: rake, from rādere to scrape
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012