Meaning of “vaccine” in the English Dictionary

"vaccine" in British English

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vaccinenoun [ C or U ]

uk /ˈvæk.siːn/ us /ˈvæk.siːn/

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.

(Definition of “vaccine” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"vaccine" in American English

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vaccinenoun [ C ]

us /ˈvæk·sin, vækˈsin/

a special substance that you take into your body to prevent a disease, and that contains a weakened or dead form of the disease-causing organism

vaccinate
verb [ T ] us /ˈvæk·səˌneɪt/

Our children have been vaccinated for measles and other childhood diseases.
vaccination
noun [ C ] us /ˌvæk·səˈneɪ·ʃən/

Most states require all children to receive the vaccination before beginning elementary school.

(Definition of “vaccine” from the Cambridge Academic Content Dictionary © Cambridge University Press)