(n)a severe or even fatal form of vaccinia that occurs mainly in persons with an immunological deficiency; characterized by progressive enlargement of the initial lesion, Syn.vaccinia gangrenosa
(n)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, Syn.variola vaccine, vaccina, variola vaccinia, variola vaccina