vaccine

vac·cine

noun \vak-ˈsēn, ˈvak-ˌ\

Definition of VACCINE

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>