Meaning & use
protozoan
A single-celled microscopic organism, typically able to move and often found in water or soil.
See it in a sentence
The biology class examined a protozoan swimming across the slide under the microscope.
Malaria is caused by a protozoan that infects red blood cells after a mosquito bite.
A note on using this word
Protozoan is used as both a noun and, less commonly, an adjective; the plural is 'protozoa' or 'protozoans.'
Words with a similar meaning
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