universal donor

noun

1. a person with blood of group O.

universal donor

noun

1. a person who has blood of group O and whose blood may be safely transfused to persons with most other blood types

universal donor

1. A person who has group O blood and is therefore able to serve as a donor to a person with any other blood type. Group O blood contains red blood cells that do not have the antigen A or B and thus do not react with antibodies to these antigens found in the plasma of the other blood types.

2. See also blood type

Word History and Origins

Origin of universal donor¹

First recorded in 1920–25