Source : Webster's Revised Unabridged Dictionary (1913)

Dealer \Deal"er\, n.
   1. One who deals; one who has to do, or has concern, with
      others; esp., a trader, a trafficker, a shopkeeper, a
      broker, or a merchant; as, a dealer in dry goods; a dealer
      in stocks; a retail dealer.

   2. One who distributes cards to the players.

Source : WordNet®

dealer
     n 1: someone who purchases and maintains an inventory of goods to
          be sold [syn: {trader}, {bargainer}, {monger}]
     2: a firm engaged in trading
     3: a seller of illicit goods; "a dealer in stolen goods"
     4: the major party to a financial transaction at a stock
        exchange; buys and sells for his own account [syn: {principal}]
     5: the person who distributes the playing cards in a card game