pro·to·zo·an (pr  t -z n) also pro·to·zo·on (- n)n. pl. pro·to·zo·ans or pro·to·zo·a (-z ) also pro·to·zo·ons Any of a large group of single-celled, usually microscopic, eukaryotic organisms, such as amoebas, ciliates, flagellates, and sporozoans. pro to·zoan, proto·zoal, proto·zoic adj. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  protozoon - any of diverse minute acellular or unicellular organisms usually nonphotosyntheticprotoctist - any of the unicellular protists phylum Protozoa, Protozoa - in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers sarcodine, sarcodinian - protozoa that move and capture food by forming pseudopods rhizopod, rhizopodan - protozoa characterized by a pseudopod arcella - an amoeba-like protozoan with a chitinous shell resembling an umbrella difflugia - a protozoan with an ovoid shell of cemented sand grains ciliate, ciliated protozoan, ciliophoran - a protozoan with a microscopic appendage extending from the surface of the cell euglena - minute single-celled green freshwater organism having a single flagella; often classed as algae flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore - a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals plantlike flagellate - unicellular organisms having many characteristics of typical algae sporozoan - parasitic spore-forming protozoan cytostome - mouth of a protozoan |
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