"vaccinia" in the noun sense
1. vaccinia, vaccina, variola vaccine, variola vaccinia, variola vaccina
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
2. cowpox, vaccinia
a viral disease of cattle causing a mild skin disease affecting the udder formerly used to inoculate humans against smallpox
Source: WordNet® (An amazing lexical database of English)
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