Source : Webster's Revised Unabridged Dictionary (1913)

Tamping \Tamp"ing\, n.
   1. The act of one who tamps; specifically, the act of filling
      up a hole in a rock, or the branch of a mine, for the
      purpose of blasting the rock or exploding the mine.

   2. The material used in tamping. See {Tamp}, v. t., 1.

   {Tamping iron}, an iron rod for beating down the earthy
      substance in tamping for blasting.