NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,916 terms related to cancer and medicine.
Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.
- listen (bak-TEER-ee-uh)
- A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium.