Definition of serum in English:

serum

Syllabification: se·rum
Pronunciation: /ˈsi(ə)rəm
 
/

noun (plural sera /ˈsi(ə)rə/ or serums)

  • 1An amber-colored, protein-rich liquid that separates out when blood coagulates.
    More example sentences
    • Blood products, sera, sperm, oocytes and embryos are not included.
    • The number of sera from patients whose blood culture grew B. psuedomallei is only 12.
    • Blood samples were then obtained and sera tested for HIV and hepatitis.
  • 1.1The blood serum of an animal, used especially to provide immunity to a pathogen or toxin by inoculation or as a diagnostic agent.
    More example sentences
    • He was given a cocktail of vaccines within 10 minutes including anti-plague and anthrax serums.
    • You could be making a fortune out of the drugs, serums and surgical hardware, and yet you have to stand on the sidelines and watch as US drug companies make a killing.

Origin

late 17th century: from Latin, literally 'whey'.

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