'Cowpock' definitions:
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Cowpock \Cow"pock`\ (-p[o^]k`), n.
See Cowpox. --Dunglison.
[1913 Webster]
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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]