NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,780 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.

conditioned response
(kun-DIH-shund reh-SPONTS)
A type of learning in which repeated exposure to something may affect a person’s behavior when they encounter an unrelated object, sound, or smell that occurred at the same time as the initial exposure. For example, a patient who always feels sick after receiving chemotherapy in a clinic that smells a certain way may be conditioned to feel sick when smelling the same odor in a different place.