Source : Webster's Revised Unabridged Dictionary (1913)

Epizootic \Ep`i*zo*["o]t"ic\, a. [Cf. F. ['e]pizo["o]tique.]
   1. (Zo["o]l.) Of or pertaining to an epizo["o]n.

   2. (Geol.) Containing fossil remains; -- said of rocks,
      formations, mountains, and the like. [Obs.]

            Epizo["o]tic mountains are of secondary formation.
                                                  --Kirwan.

   3. Of the nature of a disease which attacks many animals at
      the same time; -- corresponding to epidemic diseases among
      men.

Epizooty \Ep`i*zo"["o]*ty\, Epizootic \Ep`i*zo*["o]t"ic\, n. [F.
   ['e]pizo["o]tie.]
   An epizo["o]tic disease; a murrain; an epidemic influenza
   among horses.

Source : WordNet®

epizootic
     adj : (of animals) epidemic among animals of a single kind within
           a particular region; "an epizootic disease"