Definition of "bitmap"

bitmap

noun
plural bitmaps
1. (computing) A series of bits that represents a rasterized graphic image, each pixel being represented as a group of bits.
  Quotations
  Using the hardware blitter to move bitmaps from VRAM to VRAM is much faster than moving them from system memory to VRAM.
  2002, André LaMothe, Tricks of the Windows Game Programming Gurus, page 315