<p><strong>Noun</strong></p><ul><li>(Biochemistry)<ul><li>an estrogenic hormone, C₁₈H₂₂O₂, produced by the ovarian follicles and found during pregnancy in urine and placental tissue.</li></ul></li><li>(Pharmacology)<ul><li>a commercial form of this compound, obtained from the urine of pregnant women or synthesized from ergosterol, used in the treatment of estrogen deficiency and certain menopausal and postmenopausal conditions.</li></ul></li></ul>