donor
n.-
1 charity or blood (n.) B2 Upper Intermediatea person or organisation that gives money, food, or clothes to help others, or someone who gives blood or an organ to a hospital.
an individual or entity that contributes money, goods, or biological material (such as blood or organs) to a recipient or institution.
ExampleThe charity thanked every donor who gave money to the new school project.
ExampleThe hospital launched an urgent appeal for blood donors to ensure they had enough supplies for the upcoming holiday weekend.
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2 chemistry (n.) C1 Advanced Technical Sciencea molecule or group of atoms that gives a part of itself to another during a chemical reaction.
an atom, molecule, or ion that provides a particle (such as an electron or proton) to an acceptor during a chemical process.
ExampleIn this reaction, the first molecule acts as the electron donor.
ExampleThe efficiency of the solar cell depends on how effectively the electron donor transfers its charge to the acceptor material.
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3 for spare parts (n.) C1 Advanced Informalan old machine or car used to provide parts to fix a better one.
an object, often a vehicle or electronic device, that is sacrificed to provide functional components for the repair of another unit.
ExampleHe bought a cheap donor car just to get the engine for his project.
ExampleThe technician kept several broken laptops in the back room to serve as donors for screens and keyboards.
From Middle English donoure, donour; from Anglo-Norman donour, from Old French doneur (See French donneur).