[es-tree-awl, -ol, -trahy-]
Biochemistry. an estrogenic hormone, C 18 H 21 (OH) 3 , occurring in urine during pregnancy.
Pharmacology. a commercial form of this compound, obtained from human placentas or the urine of pregnant women, used in conditions involving estrogen deficiency.

1930–35; es(trin) + tri- + -ol1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
estriol (ˈɛstrɪˌɒl, ˈiːstrɪ-)
the usual US spelling of oestriol

oestriol or (US) estriol (ˈiːstrɪˌɒl, ˈɛstrɪ-)
a weak oestrogenic hormone secreted by the mammalian ovary: a synthetic form is used to treat oestrogen deficiency. Formula: C18H24O3
[C20: from oestrin + tri- + -ol1]
estriol or (US) estriol
[C20: from oestrin + tri- + -ol1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

estriol es·tri·ol (ěs'trī-ôl', -ōl', ě-strī'-)
A metabolite of estradiol and usually the predominant estrogenic metabolite found in the urine of pregnant women. Also called theelol.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The other important but less powerful estrogens are estrone and estriol.
The other important, but less powerful, estrogens are estrone and estriol.
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