Slab
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1. \Slab\, n. [OE. slabbe, of uncertain origin; perhaps
   originally meaning, a smooth piece, and akin to slape, Icel.
   sleipr slippery, and E. slip, v. i.]
   1. A thin piece of anything, especially of marble or other
      stone, having plane surfaces. --Gwilt.
   2. An outside piece taken from a log or timber in sawing it
      into boards, planks, etc.
   3. (Zo["o]l.) The wryneck. [Prov. Eng.]
   4. (Naut.) The slack part of a sail.
   {Slab line} (Naut.), a line or small rope by which seamen
      haul up the foot of the mainsail or foresail. --Totten.
   

2. \Slab\, a. [Cf. Gael. & Ir. slaib mud, mire left on a river
   strand, and E. slop puddle.]
   Thick; viscous. [Obs.]
         Make the gruel thick and slab.           --Shak.
   

3. \Slab\, n.
   That which is slimy or viscous; moist earth; mud; also, a
   puddle. [Obs.] --Evelyn.