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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Intestinal worm and protozoan infections affect more than 1 billion children worldwide and are associated with stunted growth and impaired cognitive development.
Ascardia spp and Capillaria spp are the most common nematodes in pigeon (Kirsch and Degenhartdt, 1979) and protozoan infections among Haemoproteus columbae, transmitted by Pseudolynchia canariensis affects domestic as well as wild pigeon is called as pseudomalaria or pigeon malaria and is fatal to young ones.
Intestinal protozoan infections remain a public health problem in low and middle-income countries.
Overall, the prevalence of protozoan infections (0.45%) was higher than the helminth infections (0.05%).
Peixoto et al., "Giardia lamblia and respiratory allergies: a study of children from an urban area with a high incidence of protozoan infections," Jornal de Pediatria, vol.
The data from the sampled schools revealed that the pupils were more prevalent to enteric protozoan infections than helminths.
There are a number of studies so far conducted on protozoan infections including chagas, malaria, sleep sickness and leishmaniasis.
Worm and protozoan infections constitute 12% of the total disease burden in children of age 5-10.
Among the topics are herpes virus infections, skin and soft tissue infections, anaerobic bacterial infections, tuberculosis and infections by non-tuberculous mycobacteria, and protozoan infections. ([umlaut] Ringgold, Inc., Portland, OR)
(2003) the occurrence of parasitic and protozoan infections is low among captive primates, due to routine treatment with antihelminthics and antiprotozoal compounds.