debit card

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A bankcard used to make an electronic withdrawal from funds on deposit in a bank, as in purchasing goods or obtaining cash advances.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A card much like a credit card, but which takes money directly from the bank account, rather than borrowing the money from the issuer of the card.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• 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