Source : Webster's Revised Unabridged Dictionary (1913)

Toothing \Tooth"ing\, n.
   1. The act or process of indenting or furnishing with teeth.

   2. (Masonry) Bricks alternately projecting at the end of a
      wall, in order that they may be bonded into a continuation
      of it when the remainder is carried up.

   {Toothing plane}, a plane of which the iron is formed into a
      series of small teeth, for the purpose of roughening
      surfaces, as of veneers.