Resembling vaccinia.
* * *
vac·ci·noid 'vak-sə-.nȯid adj resembling vaccinia
* * *
adj.
resembling a local infection with vaccinia (cowpox) virus. A vaccinoid reaction is one of the possible results of vaccination against smallpox in individuals who already have partial immunity. The swelling, reddening, and blistering are considerably less than the so-called primary reaction that occurs after the inoculation of a person with no immunity against smallpox.
Medical dictionary. 2011.