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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Microorganismo

Microorganism
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.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.