Definition of vax in English:

vax

noun

US
informal
  • A vaccine or vaccination.

    ‘the flu vax’
    • ‘Traditional vaxes must be kept cold and don't always trigger a sufficient immune response.’
    • ‘Did we have a terrible time deciding if John should receive a vax, and if so which one? Horrible time.’
    • ‘We definitely need better flu vax especially for older patients.’
    • ‘The vaxes are essentially viral antigens, so they are basically infecting you, albeit at a low intensity.’
    • ‘Spreading misinformation about vaccines (even if you're just criticizing vax schedules) might not seem like a big deal, but it is a very big, life-and-death deal.’

Origin

1990s: abbreviation.

Pronunciation

vax

/vaks/