Etymology
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donor (n.)

mid-15c., donour, "one who gives or bestows, one who makes a grant," from Anglo-French donour, Old French doneur (Modern French donneur), from Latin donatorem (nominative donator) "giver, donor," agent noun from past participle stem of donare "give as a gift," from donum "gift" (from PIE root *do- "to give").

As "person from whom blood is removed for transfusion," by 1875; in reference to those living or dead from whom organs or tissues are removed for transplantation, by 1918 (originally of guinea pigs).

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Definitions of donor

donor (n.)
person who makes a gift of property;
Synonyms: giver / presenter / bestower / conferrer
donor (n.)
(medicine) someone who gives blood or tissue or an organ to be used in another person (the host);
From wordnet.princeton.edu