A bacterium is a tiny organism that lives in water. Bacteria can cause diseases in humans, animals, and plants.

  • The bacterium was found in the water supply.

  • The bacterium causes the disease anthrax.

Definition of bacterium


(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants



Nearby Words

bacterium Pronunciation in a video

Example Sentences for bacterium

  • 1

    At the site of infection, the neutrophils engulf and kill bacteria.

  • 2

    In these symbioses the bacteria are never released from the infection thread.

  • 3

    The bacteria also infect the roots leading to the formation of nodules.

  • 4

    The cause of sinus infection is bacteria in the lining cells of the sinuses.

  • 5

    Two important bacteria cause lung infections in foals.

  • 6

    The heat destroys the harmful bacteria that are living on the meat.

  • 7

    The augmentation of the bacteria is fast.

  • 8

    It is the bacteria in the perspiration that causes the odor.

  • 9

    It is the presence of viable bacteria in the bloodstream.

  • 10

    In such scrubbers, the bacteria scrub the pollutant.