Medical Dictionary


noun vac·cine \vak-ˈsēn, ˈvak-ˌ\

Medical Definition of VACCINE

:  matter or a preparation containing the virus of cowpox used to vaccinate a person against smallpox
:  a preparation of killed microorganisms, living attenuated organisms, or living fully virulent organisms that is administered to produce or artificially increase immunity to a particular disease <chicken pox vaccine>; also :  a mixture of several such vaccines <measles-mumps-rubella vaccine>
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