(1):
(n.) A person who buys and sells the unused parts of railroad tickets.
(2):
(n.) 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.
(3):
(n.) Same as Scalping iron, under Scalping.
(4):
(n.) A broker who, dealing on his own account, tries to get a small and quick profit from slight fluctuations of the market.
(5):
(n.) One who, or that which, scalps.