Deb·it card n.  a small usually plastic card with a magnetic coded number, similar to a credit card, which is used to pay for purchases by the electronic deduction of a sum of money (a debit) directly from the card-holder's bank account.  Such cards do not require the establishment of a credit line, and such transactions do not incur any interest payments.

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 debit card
      n : a card (usually plastic) that enables the holder to withdraw
          money or to have the cost of purchases charged directly
          to the holder's bank account