- (immunology) A substance given to stimulate the body's production of antibodies and provide immunity against a disease, prepared from the agent that causes the disease, or a synthetic substitute.
Etymology: (term, vaccinus, lang=la), from (term, vacca, , cow, lang=la) (because of early use of the cowpox virus against smallpox).
- German: Impfstoff
- Spanish: vacuna
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