/ Dictionary / Index R raster: Meaning and Definition of Find definitions for: ras•ter Pronunciation: (ras'tur), [key] — n. a pattern of scanning lines covering the area upon which the image is projected in the cathode-ray tube of a television set. a set of horizontal lines composed of individual pixels, used to form an image on a CRT or other screen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: raster (Thesaurus) Rastafarianism rastle Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language