NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,777 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.
- listen (SUB-eh-PEN-dih-mul)
- Describes the layer of cells just under the ependyma (the thin membrane that lines the fluid-filled spaces in the brain and spinal cord).