NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,812 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.

heroin
(HAYR-oh-win)
A substance made from morphine. Heroin is very addictive and it is illegal to use or sell it in the United States. It is a type of opiate.