noun
- a single-celled microorganism that can cause disease or be beneficial to living things
Usage: scientific
Examples
- The scientist studied the bacterium under a microscope.
- This bacterium helps digest food in the human intestine.
- A harmful bacterium contaminated the water supply.
- The antibiotic killed the disease-causing bacterium.
- Each bacterium reproduces by dividing into two cells.
- The soil contains millions of bacteria per gram.