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serum medical definition
noun pl. se·rums or se·ra
- A watery fluid, especially one that moistens the surface of serous membranes or that is exuded by such membranes when they become inflamed.
- The clear yellowish fluid obtained upon separating whole blood into its solid and liquid components.
- Such fluid from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual.
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