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English definition of “ABO”

ABO

noun [S]     /ˌeɪ.biːˈəʊ/ US  /-ˈoʊ-/ specialized
the system that divides human blood into four main blood groups (= types of blood), known as A, B, AB, and O: the ABO blood group systemThe circulatory system and blood
(Definition of ABO noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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