NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,791 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.

tannin
(TA-nin)
A type of chemical found in plants and in certain foods, such as fruits, vegetables, nuts, wine, and tea. Tannins have antioxidant properties and may promote good health. They are being studied in the prevention of cancer, heart disease, and other diseases. They are also used in certain medicines, fabrics, leather, and ink. A tannin is a type of polyphenol. Also called tannic acid.