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1. (n.) ABO system
a classification of human blood into four major groups, A, B, AB, and O, based on the presence on the surface of red blood cells of either of two antigens, A or B, or their absence, O: used in determining compatibility for transfusions.
Etymology: (1940–45)
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| Definition of 'abo system' |
Princeton's WordNet |
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1. (noun) ABO blood group system, ABO system, ABO group
a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
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Definitions of abo system 
