serumnoun [ C or U ]uk /ˈsɪə.rəm/ us /ˈsɪr.əm/ plural sera uk /ˈsɪə.rə/ us /ˈsɪr.ə/ serums
serum noun [ C or U ] (BLOOD)
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(Definition of “serum” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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look like a million dollars
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