NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,855 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 (FY-ber-OP-tik)
- Describes the use of a coated, thin, clear, glass or plastic fiber that can carry light and send information, including images. In medicine, flexible fiberoptic instruments are used to look inside the body. Fiberoptics are also used to deliver laser light to tumors injected with a type of drug that kills cancer cells when it is exposed to laser light.