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serum

se·rum

serum

pronunciation:
si rm
features:
Word Explorer
part of speech: noun
inflections: sera, serums
definition 1: the thin, watery fluid remaining when the solid components of blood have clotted.
definition 2: such a fluid obtained from an immunized animal and used as an antitoxin.
definition 3: any watery liquid from an animal's tissue.
derivation: serumal (adj.)
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  blood, disease, virus