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| pro·to·zo·an [ prtə zṓ ən ] (plural pro·to·zo·ans) or pro·to·zo·on [ prtə zṓ òn ] (plural pro·to·zo·ons or pro·to·zo·a [ prtə zṓ ə ]) |
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single-celled organism: a single-celled organism that can move and feeds on organic compounds of nitrogen and carbon, e.g. an amoeba. Kingdom Protoctista.
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| [Mid-19th century. < modern Latin Protozoa "first animals" < Greek zōia, plural of zōion "animal"] |
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 pro·to·zo·al adjective |
| pro·to·zo·an adjective |
| pro·to·zo·ic adjective |
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