estrone

[ es-trohn ]

noun

1. Biochemistry. an estrogenic hormone, C 18 H 22 O 2 , produced by the ovarian follicles and found during pregnancy in urine and placental tissue.
2. Pharmacology. 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.

estrone

/ ˈɛstrəʊn; ˈiːstrəʊn /

noun

1. See oestrone
   the usual US spelling of oestrone

Word History and Origins

Origin of estrone¹

First recorded in 1930–35; estr(in) + -one