Pronunciation: (es"tru-dī'ôl, -ol),[key] —n. 1. Biochem.an estrogenic hormone, C18H24O2, produced by the maturing Graafian follicle, that causes proliferation and thickening of the tissues and blood vessels of the endometrium.
2. Pharm.a commercial form of this compound, obtained from the urine of pregnant humans and mares or synthesized, used in the treatment of estrogen deficiency and certain menopausal and postmenopausal conditions.