Word Study
cowpox
CIDE DICTIONARY
cowpox, n.
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]
OXFORD DICTIONARY
cowpox, n. a disease of cows, of which the virus was formerly used in vaccination against smallpox.
For further exploring for "cowpox" in Webster Dictionary Online