\dˌɪfəɹˈɛnʃə͡l kˈalkjʊləs], \dˌɪfəɹˈɛnʃə‍l kˈalkjʊləs], \d_ˌɪ_f_ə_ɹ_ˈɛ_n_ʃ_əl k_ˈa_l_k_j_ʊ_l_ə_s]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.

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abo group

  • a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are and B AB O
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