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bacterium British & World English

A member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease

coliform bacterium British & World English

A rod-shaped bacterium, especially Escherichia coli and members of the genus Aerobacter, found in the intestinal tract of humans and other animals. Its presence in water indicates fecal contamination and can cause diarrhea and other dysenteric symptoms