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Definition of Universal donor
1. Noun. A person whose type O Rh-negative blood may be safely transfused into persons with other blood types.
Generic synonyms: Blood Donor
Medical Definition of Universal donor
1. In blood grouping, a person belonging to group O; i.e., one whose erythrocytes do not contain either agglutinogen A or B and are, therefore, not agglutinated by plasma containing either of the ordinary isoagglutinins, alpha or beta. (05 Mar 2000)