deal·er 
(dēlər)
(dēlər)n.
1. One that is engaged in buying and selling: a used-car dealer; a drug dealer.
2. Games
a. The person who distributes the cards in a game of cards.
b. In a game of cards, especially poker, the position from which cards are dealt clockwise around the table, usually marked by the button.
3. A croupier.