Definition of Protozoa in English:


plural noun

  • 1A phylum or grouping of phyla which comprises the single-celled microscopic animals, which include amoebas, flagellates, ciliates, sporozoans, and many other forms. They are now usually treated as a number of phyla belonging to the kingdom Protista.

    • ‘The first edition's chapter on Protozoa recognized 7 phyla.’
    • ‘This view is based on the early idea that sponges are grouped with the Protozoa.’
    1. 1.1protozoa Organisms of the Protozoa group.
      • ‘Microbiological contaminants, including protozoa, bacteria and viruses, are normally killed by chlorinating and other treatment.’
      • ‘From 6 to 26 nucleotide repeats have been identified in the chromosomal ends of Protozoa, fungi, nematodes, plants, and vertebrates.’
      • ‘Most amoebae strains were obtained from the Culture Collection of Algae and Protozoa (Windermere, United Kingdom).’
      • ‘What was decided among the prehistoric Protozoa cannot be annulled by Act of Parliament…’
      • ‘Instead, higher decomposition of organic matter might lead to higher populations of bacteria, protozoa, and organisms using these as food supply, which in turn can be consumed by zooplankton.’


Modern Latin (plural), from proto- ‘first’ + Greek zōion ‘animal’.