NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,916 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.

irreversible toxicity
(eer-ree-VER-sih-bul tok-SIH-sih-tee)
Side effects that are caused by toxic substances or something harmful to the body and do not go away.