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• n  any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

• Cause of the disease is a trypanosome, protozoon which under the microscope resembles an auger.
• The Anopheline mosquito bites a person and injects the malaria organism, a protozoon about one-fifth the size of a red blood cell.
• The cause of the disease is an oval protozoon with a short, slender tail.

• protozoan