Main Entry: vac·cine

Pronunciation: \vak-ˈsēn, ˈvak-ˌ\

Function: noun

1 : matter or a preparation containing the virus of cowpox used to vaccinate a person against smallpox
2 : 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>