- a person with blood of group O.
Origin of universal donor
First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a person who has blood of group O and whose blood may be safely transfused to persons with most other blood types
- A person whose red blood cells do not contain agglutinogen A or B and are therefore not agglutinated by plasma containing either of the ordinary isoagglutinins, alpha or beta; a person who has group O blood.
- 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. See also blood type.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.