bitmap

n. computerized picture in which each pixel is represented by bits or groups of bits

In computer graphics, a bitmap or pixmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of bits. Now, along with pixmap, it commonly refers to the similar concept of a spatially mapped array of pixels. Raster images in general may be referred to as bitmaps or pixmaps, whether synthetic or photographic, in files or in memory.
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Noun
1. an image represented as a two dimensional array of brightness values for pixels
(synonym) electronic image
(hypernym) picture, image, icon, ikon

n. bit map, representation of a picture as a group of bits

n. bitmap, computerized picture in which each pixel is represented by bits or groups of bits