NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,894 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.

fast-neutron beam radiation
(fast-NOO-tron beem RAY-dee-AY-shun)
A type of radiation therapy that uses tiny particles called neutrons made by a machine called a cyclotron.