Source : Webster's Revised Unabridged Dictionary (1913)

Donor \Do"nor\, n. [F. donneur, OF. daneor, fr. donner. See
   {Donee}, and cf. {Donator}.]
   1. One who gives or bestows; one who confers anything
      gratuitously; a benefactor.

   2. (Law) One who grants an estate; in later use, one who
      confers a power; -- the opposite of donee. --Kent.

            Touching, the parties unto deeds and charters, we
            are to consider as well the donors and granters as
            the donees or grantees.               --Spelman.

Source : WordNet®

donor
     n 1: person who makes a gift of property [syn: {giver}, {presenter}]
     2: (medicine) someone who gives blood or tissue or an organ to
        be used in another person (the host)