Definitions for vaccinia gangrenosa
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Princeton's WordNet
progressive vaccinia, vaccinia gangrenosa(noun)
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
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"vaccinia gangrenosa." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/vaccinia gangrenosa>.

