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se·rum

serum

 
pronunciation:
si rm
features:
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part of speech: noun
inflections: sera, serums
definition 1: the thin, watery liquid that remains when the solid parts of blood have formed a clot.
definition 2: the antidote given to a person or animal to protect from a disease or venom. It is taken from an animal that has been exposed to the same disease or venom.
It's a good thing the doctor had some rattlesnake serum on hand when Joe was bitten.
derivation: serumal (adj.)
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  blood, disease, virus