n 1 a  :  COWPOX  b  :  the usu. mild systemic reaction of an individual following vaccination against smallpox  2  :  the poxvirus that is the causative agent of cowpox and is used for vaccination against smallpox vac*cin*i*al adj 
 
 
 
Similar sounding terms:  fu·co·san  vac·cine  vac·ci·nee 
 
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