A person of blood group O, who can in theory donate blood to recipients of any ABO blood group.
- It's O negative blood that makes a universal donor.
- People with ‘O’ type blood are universal donors.
- As blood group O negative we are, apparently, much in demand as universal donors, and the blood service is more than welcome to as much of the stuff as they can safely pump out of us.
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Syllabification: u·ni·ver·sal do·nor
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