DONOR

noun Etymology: Middle English donoure, from Anglo-French doneur, from Latin donator, from donare Date: 15th century one that gives, donates, or presents something, one used as a source of biological material (as blood or an organ), 3. a compound capable of giving up a part (as an atom, chemical group, or subatomic particle) for combination with an acceptor, an impurity added to a semiconductor to increase the number of mobile electrons