Source : Webster's Revised Unabridged Dictionary (1913)

Grainer \Grain"er\, n.
   1. An infusion of pigeon's dung used by tanners to neutralize
      the effects of lime and give flexibility to skins; --
      called also {grains} and {bate.}

   2. A knife for taking the hair off skins.

   3. One who paints in imitation of the grain of wood, marble,
      etc.; also, the brush or tool used in graining.