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  • noun
    /ˈsirəm/ , pl serums or sera /ˈsirə/
    [noncount] medical :the part of blood that is like water and that contains substances (called antibodies) that fight disease
    blood serum
    medical :serum from an animal's blood that can be added to a person's blood to prevent or cure disease [noncount]
    [noncount] biology :the watery part of a fluid found in a plant