Relating to vaccine or vaccination.
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vac·ci·nal 'vak-sən-əl, vak-'sēn- adj of or relating to vaccine or vaccination <a \vaccinal allergy> <\vaccinal control of a disease>
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vac·ci·nal (vakґsĭ-nəl) [L. vaccinus] 1. pertaining to vaccinia, to vaccine, or to vaccination. 2. having protective qualities when used by way of inoculation.Medical dictionary. 2011.