Definition of "vaccine"
vaccine1
/ˈvæksiːn/
adjective
not comparable
vaccine2
/ˈvæksiːn/
noun
countable and uncountable, plural vaccines
(immunology)
A substance given to stimulate a body's production of antibodies and provide immunity against a disease without causing the disease itself in the treatment, prepared from the agent that causes the disease (or a derivative of it; or a related, also effective, but safer disease), or a synthetic substitute; also, a dose of such a substance.