debit card

A debit card is a plastic card which provides an alternative payment method to cash when making purchases. Physically the card is an ISO 7810 card like a credit card; however, its functionality is more similar to writing a check as the funds are withdrawn directly from either the cardholder's bank account (often referred to as a check card), or from the remaining balance on a gift card.
See more at Wikipedia.org...

Noun
1. 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
(hypernym) open-end credit, revolving credit, charge account credit
(part-meronym) magnetic stripe

A card enabling the holder to have his/her purchases directly charged to funds on his/her account at a deposit-taking institution. (This may sometimes be combined with another function, e.g. that of a cash card or cheque guarantee card.)