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Protozoon (Noun)

Any of diverse minute acellular or unicellular organisms usually nonphotosynthetic.

Nouns denoting animals.

The sample was infested with a variety of protozoa, including Giardia and Trichomonads.
Protozoons such as Amoeba and Paramecium are commonly found in freshwater environments.
Malaria is caused by a protozoon of the genus Plasmodium, which is transmitted by the bite of an infected mosquito.
Stained slides were used to identify and study the cell structure of various protozoons in the laboratory.
Amoeboid protozoons have been observed to engulf and digest bacteria and other small organisms in their environment.