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animal equivalent of epidemic, 1748, from French épizootique, from épizootie, irregularly formed from Greek epi (see epi-) + zoon (see zoo).
epizootic ep·i·zo·ot·ic (ěp'ĭ-zō-ŏt'ĭk)adj. Affecting a large number of animals at the same time within a particular region or geographic area. Used of a disease.