scalping knife

from The Collaborative International Dictionary of English v.0.48

Scalping \Scalp"ing\ (sk[a^]lp"[i^]ng),
   a. & n. from {Scalp}.
   [1913 Webster]

   {Scalping iron} (Surg.), an instrument used in scraping foul
      and carious bones; a raspatory.

   {Scalping knife}, a knife used by North American Indians in
      scalping.
      [1913 Webster]