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Define the word vaccinia

"Vaccinia" gcide "The Collaborative International Dictionary of English v.0.48"

Vaccinia \Vac*cin"i*a\, n. [NL. See Vaccine.] (Med.)
   Cowpox; vaccina. See Cowpox.
   [1913 Webster]

"vaccinia" wn "WordNet (r) 2.0"

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]