[es-tree-awl, -ol, -trahy-]
  1. Biochemistry. an estrogenic hormone, C18H21(OH)3, occurring in urine during pregnancy.
  2. Pharmacology. a commercial form of this compound, obtained from human placentas or the urine of pregnant women, used in conditions involving estrogen deficiency.

Origin of estriol

First recorded in 1930–35; es(trin) + tri- + -ol1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for estriol


  1. the usual US spelling of oestriol
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

estriol in Medicine


[ĕstrī-ôl′, -ōl′, ĕ-strī-]
  1. A metabolite of estradiol and usually the predominant estrogenic metabolite found in the urine of pregnant women.theelol
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.