Main Entry:

ras·ter

Pronunciation:

\ˈras-tər\

Function:

noun

Etymology:

German, from Latin raster, rastrum rake, from radere to scrape

Date:

1934

: a scan pattern (as of the electron beam in a cathode-ray tube) in which an area is scanned from side to side in lines from top to bottom ; also : a pattern of closely spaced rows of dots that form an image (as on the cathode-ray tube of a television or computer display)