Etymology
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epizootic (n.)

animal equivalent of epidemic, 1748, from French épizootique, from épizootie, irregularly formed from Greek epi "on, upon" (see epi-) + zōon "animal" (from PIE root *gwei- "to live"). As an adjective from 1790.

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Definitions of epizootic

epizootic (adj.)
(of animals) epidemic among animals of a single kind within a particular region;
an epizootic disease
From wordnet.princeton.edu