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Scalper

//ˈskælpɚ// noun

Noun

1
One who scalps, or removes the scalp of another.
"Denouncing representations of hostile Indians as vicious scalpers of innocent settlers […]"
2
someone who buys something and resells it at a price far above the initial cost wordnet
3
One who scalps tickets to popular entertainment events: buying them in advance and then selling them (e.g. online or just outside the venue of the event), often at inflated prices. Canada, US
"We could see three different scalpers moving through the crowd outside the arena, each muttering the characteristic refrain: “Need any tickets?”"
4
One who scalps any other item with limited availability. broadly
5
A gambler who scalps.
"The only sure thing about scalping the Series today is that the scalper is paying the bookie a greater profit because he is making a greater number of bets."

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6
A person on an open outcry exchange trading floor who buys and sells rapidly for his or her own account, aiming to buy from a seller and a little later sell to a buyer, making a small profit from the difference (roughly the amount of the bid/offer spread, or less).
7
A machine for removing the ends of grain, such as wheat or rye, or for separating the different grades of broken wheat, semolina, etc.
8
A surgical instrument for scraping carious bones.

From scalp + -er.

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