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Definition of serum noun from the Oxford Advanced American Dictionary

     

    serum

     noun
    noun
    NAmE//ˈsɪrəm//
     
    (pl. sera
    NAmE//ˈsɪrə//
     
     or serums)
     
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  1. 1[uncountable] (biology) the thin liquid that remains from blood when the rest has clotted
  2. 2[uncountable, countable] (medical) serum taken from the blood of an animal and given to people to protect them from disease, poison, etc. snakebite serum
  3. 3[uncountable] any liquid like water in body tissue
See serum in the Oxford Advanced Learner's Dictionary
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