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antivaxxer

or an·ti-vax·xeror an·ti·vax·er

[an-tee-vak-ser, an-tahy-]
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noun Informal: Disparaging.
  1. a person who distrusts or is against vaccination, especially a parent who refuses to have a young child vaccinated.

Origin of antivaxxer

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018