Source : Webster's Revised Unabridged Dictionary (1913)

Scarifier \Scar"i*fi`er\, n.
   1. One who scarifies.

   2. (Surg.) The instrument used for scarifying.

   3. (Agric.) An implement for stripping and loosening the
      soil, without bringing up a fresh surface.

            You have your scarifiers to make the ground clean.
                                                  --Southey.