vac·cin·ia /vækˈsɪniə/
 牛痘
 vac·cin·ia /vækˈsɪnɪə/ 名詞
 牛痘苗
 Vac·cin·i·a n.  Med. Cowpox; vaccina. See Cowpox.
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 vaccinia
      n 1: a local infection induced in humans by innoculation with the
           virus causing cowpox in order to confer resistance to
           smallpox; normally lasts three weeks and leaves a pitted
           scar [syn: vaccina, variola vaccine, variola
           vaccinia, variola vaccina]
      2: a viral disease of cattle causing a mild skin disease
         affecting the udder; formerly used to inoculate humans
         against smallpox [syn: cowpox]