megestrol

Definition of megestrol acetate
National Cancer Institute

megestrol acetate

(meh-JES-trol A-seh-tayt)
A drug used in tablet form to relieve the symptoms of advanced breast cancer and endometrial cancer. It is also being studied in the treatment of other conditions and types of cancer. Megestrol acetate blocks the effects of the hormone estrogen in the body, which may help keep some cancer cells from growing. It is a type of progestin.

Source: NCI Dictionary of Cancer Terms