noun one who, or that which, scalps.
2. scalper ·noun a person who buys and sells the unused parts of railroad tickets.
3. scalper ·noun ·same·as scalping iron, under scalping.
4. scalper ·noun a broker who, dealing on his own account, tries to get a small and quick profit from slight fluctuations of the market.
5. scalper ·noun a person who buys tickets for entertainment or sports events and sells them at a profit, often at a much higher price. also, ticket scalper.