Pronunciation: (dō'nur),[key] —n. 1. a person who gives or donates.
2. Med.a person or animal providing blood, an organ, bone marrow cells, or other biological tissue for transfusion or transplantation.
3. Law.a person who gives property by gift, legacy, or devise, or who confers a power of appointment.
—adj. of or pertaining to the biological tissue of a donor: donor organ.