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[ras-ter] /ˈræs tər/
Television. a pattern of scanning lines covering the area upon which the image is projected in the cathode-ray tube of a television set.
Computers. a set of horizontal lines composed of individual pixels, used to form an image on a CRT or other screen.
1950-55; < German < Latin rāstrum toothed hoe, rake, derivative of rādere to scratch, scrape Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for raster
  • He then sends this to a shop that raster image processes-or rips-it into bits that are painted onto a film with a laser.
  • raster, in the story, also supplies some of the comedy.
  • Illustrator works well for generating vector art, but it's a pain for use with raster images such as photos.
  • The raster image resource returns a composite image for a single raster catalog item.
  • In raster format, a grid is used to represent the study area.
  • The raster data format is well suited for representing the natural environment.
British Dictionary definitions for raster


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
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
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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
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raster in Technology

The area of a video display that is covered by sweeping the electron beam of the display in a series of horizontal lines from top to bottom. The beam then returns to the top during the vertical flyback interval.
See also CRT, frame buffer.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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