NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,458 terms related to cancer and medicine.
We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget.
- listen (MY-kroh-OR-guh-NIH-zum)
- An organism that can be seen only through a microscope. Microorganisms include bacteria, protozoa, algae, and fungi. Although viruses are not considered living organisms, they are sometimes classified as microorganisms.