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 (prō′tə-zō′ən) also pro·to·zo·on (-ŏn′)
n. pl. pro·to·zo·ans or pro·to·zo·a (-zō′ə) also pro·to·zo·ons
Any of numerous chiefly single-celled eukaryotic organisms, most of which move about freely and ingest food, including the amoebas, ciliates, flagellates, and apicomplexans. Protozoans along with certain algae, oomycetes, and some other groups make up the protists.

[From New Latin Prōtozōa, former subkingdom name : proto- + -zōa, pl. of -zōon, -zoon.]

pro′to·zo′an, pro′to·zo′al, pro′to·zo′ic adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.protozoa - in some classifications considered a superphylum or a subkingdomProtozoa - in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers
kingdom Protoctista, Protoctista - in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals
protozoan, protozoon - any of diverse minute acellular or unicellular organisms usually nonphotosynthetic
class Sarcodina, Sarcodina - characterized by the formation of pseudopods for locomotion and taking food: Actinopoda; Rhizopoda
Ciliata, Ciliophora, class Ciliata, class Ciliophora - class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle
class Sporozoa, Sporozoa - strictly parasitic protozoans that are usually immobile; includes plasmodia and coccidia and piroplasms and malaria parasites
phylum - (biology) the major taxonomic group of animals and plants; contains classes
References in classic literature ?
In attempting to understand the elements out of which mental phenomena are compounded, it is of the greatest importance to remember that from the protozoa to man there is nowhere a very wide gap either in structure or in behaviour.
Ticks transmit a variety of different pathogens including bacteria, protozoa, and viruses that can produce serious and even fatal disease in humans and animals.
Protozoa was absolutely dominated in zooplankton abundance and its mean value ranged from 2710.
It is true that it is difficult for microscopists who are not familiar with the technique to become skilled at differentiating between multiflagellated protozoa and bronchial ciliated cells.
Study was done to determine the role of flushing in removal of free-living protozoa, Legionella spp.
Reviews of the effects of enteric protozoa on digestion and productivity by ruminants have concluded removal of rumen ciliate protozoa reduces enteric methane (C[H.
Archaea, yeasts, protozoa, and viruses are the nonbacterial microorganisms that are found in plaque.
2mg + Biotin30mcg + Calcium ascorbate 50mg + Zinc(as zinc monomethionine) 10mg + Selenium (as sodium selenate) 40mcg + chromium (as chromium picolinate) 35mcg + Magnesium (as light magnesium oxide) 10mg + Vitamin E acetate 15 IU + Mixed carotene 10% 10mg + Vitamin D3 (stabilized) 200 IU Physician Sample, Povidone Iodine Solution 10% w/v (Film forming Iodine complex effective against both Gm-ve & Gm+ve bacteria, fungi, protozoa, yeasts and viruses), Povidone Iodine Solution 10% w/v (Film forming Iodine complex effective against both Gm-ve & Gm+ve bacteria, fungi, protozoa, yeasts and viruses), Povidone Iodine Scrub 7.
The morphological characteristics of these protozoa are described and their relationship to similar entodiniid species are discussed.
2008) reported that tannins reduced the methane emission by inhibiting protozoa as well as presumably lowering the methanogenic activity of protozoal-associated methanogens.
Infections with protozoa are common in poultry that may range from mild to severe resulting in the disease.
Immunohistochemistry was negative for Sarcocystis falcatula and Neospora caninum and confirmed the protozoa as T gondii.