• synonyms


[ ras-ter ]
/ ˈræs tər /


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.

Nearby words

rasta, rastafari, rastafarian, rastafarianism, rastaquouere, raster, rastle, rastus, rasure, rat, rat cheese

Origin of raster

1950–55; < German < Latin rāstrum toothed hoe, rake, derivative of rādere to scratch, scrape Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for raster


/ (ˈræstə) /


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


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

Word Origin and History for raster



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

Online Etymology Dictionary, © 2010 Douglas Harper