Definition of “serum” - 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/ serums

(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, colorless part of the blood, or this liquid taken from blood, used for medical purposes

(Definition of “serum” from the Cambridge Academic Content Dictionary © Cambridge University Press)