A donor in general is a person that donate something voluntarily. Usually used to represent a form of pure altruism but sometimes used when the payment for a service is recognised by all parties as representing less than the value of the donation and that the motivation is altruistic.Often the word is used as a short for:
Blood donor
Electron donor — (by analogy) a technical term in chemistry and semiconductor physics (see also the next entry)
Acceptor
Organ donor
Sperm donor
Charitable donor
Egg Donor
In literature:
Donor is a stock character of fairy tales
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