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antivax

or an·ti-vax

[an-tee-vaks, an-tahy-]
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adjective Informal: Disparaging.
  1. of, relating to, or noting people, especially parents of young children, who distrust or are against vaccination: the antivax movement.
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Origin of antivax

1990–95; anti- + vax (shortening and alteration of vaccination)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018