donor Definition

1. Someone who donates something, especially money.

Thesaurus: contributor, giver, benefactor, donator, sponsor, philanthropist; Antonym: beneficiary.
2. Someone or animal that provides blood, semen, living tissue or organs for medical use, eg blood for transfusion or a kidney for transplantation.
3. electronics.
An impurity in the form of a chemical element, such as antimony, that is deliberately added to a pure semiconductor material such as silicon, so called because it donates electrons to the semiconductor and so increases the conductivity of the latter.
4. chem.
An atom that donates a pair of electrons to an acceptor, resulting in the formation of a coordinate bond (see coordinate noun 3).