What does "scalper" mean?

Scalper: (Surg.) Same as Scalping iron, under Scalping.

Additional senses

  1. 2.A broker who, dealing on his own account, tries to get a small and quick profit from slight fluctuations of the market. [Cant]
  2. 3.A person who buys and sells the unused parts of railroad tickets. [Cant]

Sources