a person who gives or donates.
Medicine/Medical. a person or animal providing blood, an organ, bone marrow cells, or other biological tissue for transfusion or transplantation: sperm donor; organ donor.
Law. a person who gives property by gift, legacy, or devise, or who confers a power of appointment.
of or pertaining to the biological tissue of a donor: donor organ.

1400–50; late Middle English donour < Anglo-French (Old French doneur) < Latin dōnātor, equivalent to dōnā(re) (see donation) + -tor -tor

donorship, noun
predonor, noun

1. supporter, contributor, sponsor, patron. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
donor (ˈdəʊnə)
1.  a person who makes a donation
2.  med any person who voluntarily gives blood, skin, a kidney etc, for use in the treatment of another person
3.  law
 a.  a person who makes a gift of property
 b.  a person who bestows upon another a power of appointment over property
4.  the atom supplying both electrons in a coordinate bond
5.  Compare acceptor an impurity, such as antimony or arsenic, that is added to a semiconductor material in order to increase its n-type conductivity by contributing free electrons
[C15: from Old French doneur, from Latin dōnātor, from dōnāre to give]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1439, from Anglo-Fr. donour, from O.Fr. doneur, from L. donatorem (nom. donator), from donare "give as a gift" (see donation). Of blood, from 1910; of organs or tissues, from 1918.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

donor do·nor (dō'nər)

  1. One from whom blood, tissue, or an organ is taken for use in a transfusion or transplant.

  2. A chemical compound that can transfer an atom, a radical, or a particle to an acceptor.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
donor   (dō'nər)  Pronunciation Key 
  1. An atom or molecule that releases one or more electrons to another atom or molecule, resulting in a chemical bond or flow of electric current. Compare acceptor. See also electron carrier.

  2. An individual from whom blood, tissue, or an organ is taken for transfusion, implantation, or transplant.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for donors
The prevalence of mad cow disease is one in a million, probably less for donors.
It was necessary to get the shortage of donors back on the political agenda.
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