living donornoun [ C ]
/ˌlɪv.ɪŋ ˈdəʊ.nər//ˌlɪv.ɪŋ ˈdoʊ.nɚ/a living person who gives one of their organs for a transplant (= an operation to put a new organ into a sick person's body):
Last year, 191 people received kidneys from living donors.
Part of the liver is transplanted from a living donor into an adult patient.