[do.nor] n [MF doneur, fr. L donator, fr. donare] (15c) 1: one that gives, donates, or presents something
2: one used as a source of biological material (as blood or an organ) 3 a: a compound capable of giving up a part (as an atom, chemical group, or subatomic particle) for combination with an acceptor b: an impurity added to a semiconductor to increase the number of mobile electrons