NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,894 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.

human immunodeficiency virus
(HYOO-mun IH-myoo-noh-dih-FIH-shun-see VY-rus)
The cause of acquired immunodeficiency syndrome (AIDS). Also called HIV.