/ras"teuhr/ , n.
1. Television. a pattern of scanning lines covering the area upon which the image is projected in the cathode-ray tube of a television set.
2. Computers. a set of horizontal lines composed of individual pixels, used to form an image on a CRT or other screen.
[ 1950-55; rastrum toothed hoe, rake, deriv. of radere to scratch, scrape ]