from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of protozoan.
  • n. Plural form of protozoon.

from the GNU version of the Collaborative International Dictionary of English

  • The lowest of the grand divisions of the animal kingdom.

from The Century Dictionary and Cyclopedia

  • Primordial or first-formed animals, or cell-animals; protozoans: a subkingdom of Animalia or prime division of animals, contrasted with Metazoa, or all other animals collectively.

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

  • n. in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers


Sorry, no etymologies found.


  • In other words, the existence of H1 in protozoa may best be explained by the existence of H1 in metazoans.

    Another Protozoan and Front-Loading

  • If H1 was indeed designed, given its minimal role in protozoa, it might constitute a very good example of front-loading evolution such that the initial eukaryotic state was prepared to evolve a multicellular state.

    Another Protozoan and Front-Loading

  • Living alongside bacteria—in water, soil, and bodies—were much larger but still microscopic single-celled organisms known as protozoa.

    Parasite Rex

  • The protozoa are the most widely distributed and the most universal of the parasites.

    Disease and Its Causes

  • There are some diseases, as, for instance, Texas fever and rabies, which are caused by a minute animal parasite known as protozoa, while others again, like lumpy jaw and aspergillosis, are caused by fungi.

    Special Report on Diseases of the Horse

  • The cells of almost all eukaryotes (animals, plants, fungi, algae, protozoa -- in other words, the living things except bacteria, archaea, and a few protists) contain intracellular organelles called mitochondria, which produce ATP. - Articles related to Scientists uncover mysterious workings of cholera bacteria

  • Infectious agents (such as protozoa, bacteria and viruses) and their associated vector organisms (such as mosquitoes, ticks and sandflies) are devoid of thermostatic mechanisms, and reproduction and survival rates are thus strongly affected by fluctuations in temperature.

    The Volokh Conspiracy » British High Court decision on “An Inconvenient Truth”:

  • In the 1950s, the Foraminifera, along with other microscopic organisms "protozoa", were considered to be animals.

    Archive 2006-11-01

  • The size of such organisms, such as protozoa, bacteria and viruses, range within a few micrometers (1 mm is a thousandth of a millimetre) or even less.

    1. Historical development and experience with water treatment

  • At the same time, microbial predators such as protozoa tend to dampen the efficiency of would-be oil-eating microbes.

    Scientific American


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  • I can't find dictionary support for the singular tag...

    March 28, 2009