serum

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