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The Collaborative International Dictionary
cowpock

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.

Wiktionary
cowpock

n. (obsolete form of cowpox English)