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vaccine

noun [C or U]
 
 
/ˈvæk.siːn/

Definition

C2 a substance containing a virus or bacterium in a form that is not harmful, given to a person or animal to prevent them from getting the disease that the virus or bacterium causes: This vaccine protects against some kinds of the bacteria.Immunology and vaccination
(Definition of vaccine noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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