serum

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se·rum / ˈsi(ə)rəm/ • n. (pl. se·ra / ˈsi(ə)rə/ or se·rums) an amber-colored, protein-rich liquid that separates out when blood coagulates. ∎  the blood serum of an animal, used esp. to provide immunity to a pathogen or toxin by inoculation or as a diagnostic agent.

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