'Debit card' definitions:

Definition of 'debit card'

(from WordNet)
noun
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

Definition of 'Debit card'

From: GCIDE
  • Debit card \Deb"it card`\, n. [See debit.] 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. [1913 Webster]