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serum

Syllabification: (se·rum)

Pronunciation: /ˈsi(ə)rəm/

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Definition of serum

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

an amber-colored, protein-rich liquid that separates out when blood coagulates.
the blood serum of an animal, used especially to provide immunity to a pathogen or toxin by inoculation or as a diagnostic agent.