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Definition of: protozoan
(prō′tə·zō′ən) noun
Any of a large, diverse, and universal phylum of eucaryotic microorganisms, including free-living unicellular and colonial forms, often having complicated life cycles and parasitizing various animals. Also pro′to·zo′on plural ·zo′a. [<NL <Gk. prōtos first + zōia, plural of zōion an animal]
—pro′to·zo′an, pro′to·zo′ic adjective
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