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/ˌpɹəʊ.təˈzəʊ.ən/ · noun
(cytology) Any of the diverse group of eukaryotes, of the phylum Protozoa, that are primarily unicellular, existing singly or aggregating into colonies, are usually nonphotosynthetic, and are often classified further into phyla according to their capacity for and means of motility, as by pseudopods, flagella, or cilia..
Use protozoan when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Protozoan means (cytology) Any of the diverse group of eukaryotes, of the phylum Protozoa, that are primarily unicellular, existing singly or aggregating into colonies, are usually nonphotosynthetic, and are often classified further into phyla according to their capacity for and means of motility, as by pseudopods, flagella, or cilia..
Common synonyms include protozoan, protozooid, protozoon, Protozoa.
The opposite depends on the specific sense.
Use protozoan where its definition matches the intended context.
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