Wiktionary
polyestradiol phosphate
n. An estrogen in the form of a polymer, used for the palliative treatment of prostate cancer.
Wikipedia
Polyestradiol phosphate
Polyestradiol phosphate ( INN, BAN) (brand name Estradurin) is a steroidal estrogen in form of a polymer used for the palliative treatment of prostate cancer. The drug has been marketed since 1960 by Pfizer in the United States and a number of European countries.