A donor card is a card which people carry in order to make sure that, when they die, their organs are used by doctors to help people who are ill. A card, usually carried on one's person, authorizing the use of one's bodily organs for transplantation in the event of one's death. a card that you carry to show that when you die a doctor can take parts of your body to use in the medical treatment of someone else
a card that you carry on your person and that authorizes the use of your organs for transplantation after your death