noun

• (now dialectal) The top of the head; the skull.
• The part of the head where the hair grows from, or used to grow from.
  "Some tribes used to collect scalps to prove how many of the enemy they had killed in battle."
• The part of the head where the hair grows from, or used to grow from.
  "He bears for Arms : Argent, on a chevron invected gules, between two bugle-horns sable, stringed of the second in chief, and the attires of a stag affixed to the scalp in base of the third, two fasces chevronways or."
• (figuratively) A victory, especially at the expense of someone else.
  "[At the American State Convention in 1856 the Hon E. M. Yerger of Yazoo said that] he came up to the great council fire of his people, not like his friends Cobb, Hillyer and Brooke, with no scalps at his girdle that he had had a fight and a glorious victory."

verb

• (Canada, US, slang) To resell, especially tickets, usually for an inflated price, often illegally.
  "Tickets were being scalped for $300."
• (gambling) To bet on opposing competitors so as to make a profit from the bookmaker.
  "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."
• (finance) On an open outcry exchange trading floor, to buy and sell rapidly for one's 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).
• (surgery) To remove the skin of.
  "We must […]"scalp" the whole lid [of the eye]."