serum
/ˈsirəm/
noun
plural
serums
or
sera
/ˈsirə/
serum
/ˈsirəm/
noun
plural
serums
or
sera
/ˈsirə/
Britannica Dictionary definition of SERUM
1
[noncount]
medical
:
the part of blood that is like water and that contains substances (called antibodies) that fight disease
-
blood serum
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2
medical
:
serum from an animal's blood that can be added to a person's blood to prevent or cure disease
[noncount]
-
The patient was administered serum.
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[count]
-
mouse sera
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3
[noncount]
biology
:
the watery part of a fluid found in a plant