from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Affecting a large number of animals at the same time within a particular region or geographic area. Used of a disease.
  • n. An epizootic disease.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An occurrence of a disease or disorder in a population of non-human animals at a frequency higher than that expected in a given time period. Compare epidemic.
  • n. A particular epizootic (epizootically-occurring) disease.
  • n. A disease or ailment.
  • adj. Like or having to do with an epizootic: epidemic among animals.
  • adj. Containing fossils.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to an epizoön.
  • adj. Containing fossil remains; -- said of rocks, formations, mountains, and the like.
  • adj. Of the nature of a disease which attacks many animals at the same time; -- corresponding to epidemic diseases among men.
  • n. A disease attacking many animals at the same time; an epizootic disease.
  • n. A murrain; an epidemic influenza among horses.

from The Century Dictionary and Cyclopedia

  • In natural history, same as epizoic, 1.
  • In geology, containing fossil remains: said of mountains, rocks, formations, and the like.
  • Prevailing among the lower animals: applied to diseases, and corresponding to epidemic as applied to diseases prevalent among men.
  • n. The temporary prevalence of a disease among brutes at a certain place: used in exactly the same way as epidemic in reference to human beings.
  • n. A disease thus prevalent.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of animals) epidemic among animals of a single kind within a particular region


from The American Heritage® Dictionary of the English Language, 4th Edition

epi- + zo(o)- + -otic.

from Wiktionary, Creative Commons Attribution/Share-Alike License

epi- + zo- + -otic. Use of the word in the second sense, "an ailment", was likely originally a reference to a particular epizootic ailment. Both senses are attested since at least the 1800s, and the pronunciation with five syllables is explicitly attested since then as well. Dialectal pronunciation of the second sense with four syllables is attested since at least the 1910s in spellings like "epizudic" and is suggested by 1870s references to a shortened form of the word, "zooty".


  • An "epizootic," by contrast, is an epidemic that affects a large number of animals, but in one population or region. pathogen

    Influenza Glossary

  • Handel and Van Hemert are authors of two new papers describing what appears to be a building "epizootic," the wildlife equivalent of an epidemic, for which no cause has yet been identified.

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  • I fear he has the epizootic, which is a very dreadful disease. "

    Lulu, Alice and Jimmie Wibblewobble

  • HD is caused by two closely related viruses, epizootic hemorrhagic disease (EHD) or bluetongue virus.

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  • In 1872, despite a case of epizootic influenza that basically sidelined all the fire department's horses, the city didn't want to rent horses to pull fire engines, deciding that it was better to send an officer to see if it merited dragging a hose to the fire, leaving the engine in the house.

    This Day in History, 1904: General Slocum Tragedy

  • Prior to European settlement (pre-1850), a wide variety of disturbances characterized the region, ranging from frequent small-scale and localized events such as treefall gaps to rare, large-scale events such as stand-replacing fires and epizootic outbreaks.

    Eastern Cascades forests

  • Infected from belt pack represents about to decided lipitor epizootic.

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  • Typhoid epizootic sorb increased depends upon srm-rhotard vaccine.

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  • A variety of changes resulting from intensive exploitation and current management of remaining forests contributes to the lower resiliency of forests to fire and epizootic disturbances.

    Sierra Nevada forests

  • A huge epidemic, variously called “distemper” or “influenza” or “epizootic,” was storming across the country that year.



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  • "Shope had recently observed an extraordinarily violent influenza epizootic—an epidemic in animals—in swine. The overall mortality of the entire pig population had reached 4 percent; in some herds mortality had exceeded 10 percent. That very much sounded like the influenza pandemic in humans a decade earlier."

    —John M. Barry, The Great Influenza (NY: Penguin Books, 2004), 442

    February 18, 2009

  • The Panic of 1873 was caused by the "Great Epizootic," a world-wide epidemic of equine influenza that crippled commerce when horses became unable to haul people or goods. The horses recovered within a year; the economy took a decade. More info here and here.

    February 3, 2009