vac·cin·i·a 
(văk-sĭnē-ə)
(văk-sĭnē-ə)n.
1. See cowpox.
2. The usually mild, cutaneous and sometimes systemic reaction in individuals who have been inoculated with smallpox vaccine.
[New Latin vaccīnia, from Latin vaccīnus, of cows; see VACCINE.]
vac·cini·al adj.