NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,041 terms related to cancer and medicine.

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International Unit
(IN-ter-NA-shuh-nul YOO-nit)
A unit used to measure the activity of many vitamins, hormones, enzymes, and drugs. An International Unit is the amount of a substance that has a certain biological effect. For each substance there is an international agreement on the biological effect that is expected for 1 International Unit. Also called IU.