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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.