donor
nounUK /ˈdəʊnə/
US /ˈdoʊnər/
A donor is a person who gives something to help others.
The blood donor gave blood to help sick people.
OTHER MEANINGS
2. A person who gives blood or an organ to help someone who is sick.
She is an organ donor and wants to help save lives.
3. A person or group that gives money to a charity or organization.
A kind donor paid for the new school library.
4. In science, a substance or atom that gives something to another.
In this reaction, the donor gives an electron to the other molecule.