Definition of Bacterium
once-celled microscopic living organisms that can cause infection
Examples of Bacterium in a sentence
The dirty slide was placed under the microscope so that the students could see all of the bacterium growing in the microbe-infested goop.
Because of the dangerous bacterium found swimming in the water, several beachgoers became ill and infected with a disease.
The microscopic bacterium is so powerful that antibiotics can’t even clear up the strong infections the germs cause.
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