bitblt

bitblt /bit'blit/ n.  [from {BLT}, q.v.] 1. Any of a
   family of closely related algorithms for moving and copying
   rectangles of bits between main and display memory on a bit-mapped
   device, or between two areas of either main or display memory (the
   requirement to do the {Right Thing} in the case of overlapping
   source and destination rectangles is what makes BitBlt tricky).
   2. Synonym for {blit} or {BLT}.  Both uses are borderline
   techspeak.