<p><strong>Noun</strong></p><ul><li>(Biochemistry)<ul><li>an estrogenic hormone, C₁₈H₂₄O₂, produced by the maturing Graafian follicle, that causes proliferation and thickening of the tissues and blood vessels of the endometrium.</li></ul></li><li>(Pharmacology)<ul><li>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.</li></ul></li></ul>