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NCI Dictionary of Cancer Terms


levonorgestrel  listen  (LEE-voh-nor-JES-trel)

  A form of the hormone progesterone that is made in the laboratory and used to prevent pregnancy. It is being studied in the prevention of ovarian and endometrial cancer, and in the treatment of other conditions. Levonorgestrel is a type of oral contraceptive. Also called L-norgestrel and Plan B.