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pro·to·zo·an -'zō-ən n any protist of the phylum or subkingdom Protozoa
protozoan adj of or relating to the phylum or subkingdom Protozoa
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n.
a microorganism of the group protozoa.
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pro·to·zo·an (pro″to-zoґən) 2. any individual of the Protozoa; called also protozoon. 3. of or pertaining to the Protozoa; called also protozoal.Medical dictionary. 2011.