NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,846 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.

MAO inhibitor
(... in-HIH-bih-ter)
A type of drug used to treat depression. It stops the breakdown of certain chemicals in the brain that help improve a person’s mood. A MAO inhibitor is a type of antidepressant. Also called monoamine oxidase inhibitor.