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
Published under license with Merriam-Webster, Incorporated. © 1997-2004.