NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,879 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.
- radioactive seed
- listen (RAY-dee-oh-AK-tiv...)
A small, radioactive pellet that is placed in or near a tumor. Cancer cells are killed by the energy given off as the radioactive material breaks down and becomes more stable.