Top Definition
1. A person who apposes vaccinations despite scientific evidence. Often associated with a fear that they cause autism.

2. Slang for someone who refuses to acknowledge obvious facts because they're contrary to their preconceptions.
Those stupid anti-vaxers have brought back previously defeated illnesses like measles and mumps all over the country.

Did you hear Jill try to argue that Ken Ham won the debate with Billy Nye? She's such a delusional Anti-vaxer!.
by ReginaAstrum April 09, 2014

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