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WordNet (r) 3.0 (2006) (WordNet)

vaccinia
n 1: a local infection induced in humans by inoculation with the
virus causing cowpox in order to confer resistance to
smallpox; normally lasts three weeks and leaves a pitted
scar [synonym: {vaccinia}, {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 [synonym: {cowpox}, {vaccinia}]