Definition of protozoan in English:



  • A single-celled microscopic animal of a group of phyla of the kingdom Protista, such as an amoeba, flagellate, ciliate, or sporozoan.

    • ‘Each year, 300 to 500 million people contract this mosquito-borne protozoan disease, and about one million die.’
    • ‘Schindler says more of a problem are the protozoans that originate from livestock.’
    • ‘They have been considered animals, protozoans, fungi or space aliens.’
    • ‘It is caused by the single-celled protozoan parasite, Trichomonas vaginalis.’
    • ‘I devoured photographs showing the ghostly glow of bacteria on decaying fish: the shimmering phosphorescence of protozoans in tropical seas.’


  • Relating to or denoting protozoans.

    • ‘Less critical than refugia, prey switching also plays a role in protozoan persistence.’
    • ‘Twice weekly, independent protozoan samples were obtained from each compartment to determine the size of the resident P. aurelia population.’
    • ‘Giardia lamblia is one of the most widespread intestinal protozoan parasites.’
    • ‘The contact time with the iodine in the filter may be too short to kill protozoan cysts, however.’
    • ‘Malaria is an example of a disease caused by a vector-borne protozoan parasite.’