vaccine - Dictionary definition and pronunciation - Yahoo! Education
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vac·cine  audio  (vk-sn, vksn) KEY 

NOUN:
    1. A preparation of a weakened or killed pathogen, such as a bacterium or virus, or of a portion of the pathogen's structure that upon administration stimulates antibody production or cellular immunity against the pathogen but is incapable of causing severe infection.
    2. A preparation from the cowpox virus that protects against smallpox.
  2. Computer Science A software program designed to detect and stop the progress of computer viruses.
ETYMOLOGY:
From Latin vaccnus, of cows, from vacca, cow


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