Definitions from Wiktionary (serum)

▸ noun:  The clear yellowish liquid obtained upon separating whole blood into its solid and liquid components after it has been allowed to clot.
▸ noun:  Blood serum from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual.
▸ noun:  A watery liquid from animal tissue, especially one that moistens the surface of serous membranes or that is exuded by such membranes when they become inflamed, such as in edema or a blister.
▸ noun:  The watery portion of certain animal fluids like blood, milk, etc; whey.
▸ noun:  (skincare) A skincare product of varying consistencies with a high concentration of one or more active ingredients, for a targeted purpose, such as preventing acne, repairing sun damage, or moisturizing.

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