serum Meaning in the Cambridge English Dictionary
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Meaning of “serum” in the English Dictionary

"serum" in British English

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serumnoun [C or U]

uk   /ˈsɪə.rəm/  us   /ˈsɪr.əm/ (plural sera uk   /ˈsɪə.rə/  us   /ˈsɪr.ə/ or serums)

serum noun [C or U] (BLOOD)

the ​thinyellowishliquidpart of the ​blood : cholesterollevels in ​blood serum serum taken from an animal's ​blood and put into a ​human in ​order to ​fight an ​infection or a ​poison: an anti-venom serum

serum noun [C or U] (BEAUTY PRODUCT)

a ​substance in ​beautyproducts that is ​designed to ​improveyourhair or ​skin and make it less ​dry
(Definition of serum from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"serum" in American English

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serumnoun [C/U]

 us   /ˈsɪər·əm/
the ​watery, ​colorlesspart of the ​blood, or this ​liquid taken from ​blood, used for ​medicalpurposes
(Definition of serum from the Cambridge Academic Content Dictionary © Cambridge University Press)
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