Source : Webster's Revised Unabridged Dictionary (1913)

Slate \Slate\, v. t. [imp. & p. p. {Slated}; p. pr. & vb. n.
   {Slating}.]
   1. To cover with slate, or with a substance resembling slate;
      as, to slate a roof; to slate a globe.

   2. To register (as on a slate and subject to revision), for
      an appointment. [Polit. Cant]

Slating \Slat"ing\, n.
   1. The act of covering with slate, slates, or a substance
      resembling slate; the work of a slater.

   2. Slates, collectively; also, material for slating.

Source : WordNet®

slating
     n 1: thin layers of rock used for roofing [syn: {slate}]
     2: a severely critical attack; "the reviewers gave his book a
        sound slating"
     3: the act of laying slates for a roof