NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,800 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.

peak exposure
(peek ek-SPOH-zher)
The largest amount of a substance or radiation that a person is exposed to at one time. Peak exposure to a harmful substance or radiation may increase the risk of certain diseases or conditions.