Cowpox \Cow"pox`\ (-p[o^]ks`), n. (Med.)
A pustular eruptive disease of the cow, which, when
communicated to the human system, as by vaccination, protects
from the smallpox; vaccinia; -- called also {kinepox},
{cowpock}, and {kinepock}. --Dunglison.
[1913 Webster]