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  1. vac·cine
    IPA[vakˈsēn]
  2. n. noun

    • 1. a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease:

      there is no vaccine against HIV infection
    • 2. a program designed to detect computer viruses and inactivate them.

  3. Variation

    • n.: noun: vaccine, plural noun: vaccines

    • noun

      an antigenic substance prepared from the causative agent of a disease or a synthetic substitute, used to provide immunity against one or several diseases:

      a program designed to detect computer viruses and inactivate them.

    • noun

      a vaccine against poliomyelitis containing attenuated virus and given by mouth.
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