donor : Idioms & Phrases
blood donor
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noun someone who gives blood to be used for transfusions
WordNet
donor card
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noun a card that you carry on your person and that authorizes the use of your organs for transplantation after your death
WordNet
organ donor
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noun someone from whom an organ is taken for transplantation
WordNet
universal donor
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noun a person whose type O Rh-negative blood may be safely transfused into persons with other blood types