blood donor

English Thesaurus

1. someone who gives blood to be used for transfusions (noun.person)

hypernym	:	donor,
definition	:	(medicine) someone who gives blood or tissue or an organ to be used in another person (the host) (noun.person)

hyponym	:	universal donor,
definition	:	a person whose type O Rh-negative blood may be safely transfused into persons with other blood types (noun.person)