vaccine/ˈvaksiːn,ˈvaksɪn/Learn to pronouncenounnoun: vaccine;...

vaccine

/ˈvaksiːn,ˈvaksɪn/

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noun

noun: vaccine; plural noun: vaccines

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.

   "every year the flu vaccine is modified to deal with new strains of the virus"