NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,926 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.

aerobic exercise
(ayr-OH-bik EK-ser-size)
Physical activity that increases the heart rate and the body’s use of oxygen. It helps improve a person’s physical fitness.