n.[C]

1. 赠送人；捐赠者
2. 【医】供血者；献皮者；（器官等的）供者
   a kidney donor

   肾的供者

3. 【物】【电子】施主

n.

1. a person who donates something.
2. Chemistry  an atom or molecule that provides a pair of electrons in forming a coordinate bond.
3. Physics  an impurity atom in a semiconductor which contributes conducting electrons to the material.