slab

   1.  n.  A  continuous  horizontal  line  of pixels, all with the same
   color.

   2.  vi.  To paint a slab on an output device. Apple's QuickDraw, like
   most  other professional-level graphics systems, renders polygons and
   lines  not with Bresenham's algorithm, but by calculating slab points
   for  each scan line on the screen in succession, and then slabbing in
   the actual image pixels.

[glossary]