pixmap

(Contraction of "pixel map"). A 3 dimensional array of bits corresponding to a 2 dimensional array of pixels. It is used, for example, in the X Window System to describe a memory region where graphics can be drawn without affecting the screen. Typically this is used for the efficient handling of expose events, icon images or for animation. Compare bitmap.

[Xlib Guide].

Source: The Free On-line Dictionary of Computing (27 SEP 03)