NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,390 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 (seh-DAY-shun)
- A state of calmness, relaxation, or sleepiness caused by certain drugs. Sedation may be used to help relieve anxiety during medical or surgical procedures or to help cope with very stressful events. Drugs that relieve pain may be used at the same time.