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

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World English Dictionary
raster (ˈræstə)
1.  a pattern of horizontal scanning lines traced by an electron beam, esp on a television screen
2.  to use web-based technology to turn a digital image into a large picture composed of a grid of black and white dots
[C20: via German from Latin: rake, from rādere to scrape]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Computing Dictionary

raster definition

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 http://foldoc.org
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Example sentences
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
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