NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,138 terms related to cancer and medicine.
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- listen (PROH-tuh-ZOH-ul)
- Having to do with the simplest organisms in the animal kingdom. Protozoa are single-cell organisms, such as ameba, and are different from bacteria, which are not members of the animal kingdom. Some protozoa can be seen without a microscope.