donor - Dictionary definition and pronunciation - Yahoo! Education
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do·nor  audio  (dnr) KEY 

NOUN:
  1. One that contributes something, such as money, to a cause or fund.
  2. Medicine An individual from whom blood, tissue, or an organ is taken for transfusion, implantation, or transplant.
  3. Chemistry An atom, molecule, or ion that provides a part to combine with an acceptor, especially an atom that provides two electrons to form a bond with another atom.
  4. Electronics An element introduced into a semiconductor with a negative valence greater than that of the pure semiconductor.

ETYMOLOGY:
Middle English, from Anglo-Norman donour, from Latin dntor, from dnre, to give ; see donation


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