uni versal donor

universal donor

noun
a person with blood of group O.

Origin:
1920–25

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Collins
World English Dictionary
universal donor
 
n
a person who has blood of group O and whose blood may be safely transfused to persons with most other blood types

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

universal donor u·ni·ver·sal donor (yōō'nə-vûr'səl)
n.
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
universal donor   (y'nə-vûr'səl)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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