[ es-trohn ]
/ ˈɛs troʊn /


Biochemistry. an estrogenic hormone, C18H22O2, produced by the ovarian follicles and found during pregnancy in urine and placental tissue.
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.
Also estrin.

Origin of estrone

First recorded in 1930–35; estr(in) + -one Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for estrone

/ (ˈɛstrəʊn, ˈiːstrəʊn) /


the usual US spelling of oestrone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for estrone

[ ĕstrōn′ ]


A metabolite of estradiol, commonly found in urine, having considerably less biological activity than estradiol but similar properties and uses.theelin
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.