estrogen

[es-truh-juhn]
noun Biochemistry.
any of several major female sex hormones produced primarily by the ovarian follicles of female mammals, capable of inducing estrus, developing and maintaining secondary female sex characteristics, and preparing the uterus for the reception of a fertilized egg: used, especially in synthetic form, as a component of oral contraceptives, in certain cancer treatments, and in other therapies.

Origin:
1925–30; estr(us) + -o- + -gen

antiestrogen, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
estrogen (ˈɛstrədʒən, ˈiːstrə-)
 
n
the usual US spelling of oestrogen
 
estrogenic
 
adj
 
estro'genically
 
adv

oestrogen or estrogen (ˈiːstrədʒən, ˈɛstrə-)
 
n
any of several steroid hormones, that are secreted chiefly by the ovaries and placenta, that induce oestrus, stimulate changes in the female reproductive organs during the oestrous cycle, and promote development of female secondary sexual characteristics
 
[C20: from oestrus + -gen]
 
estrogen or estrogen
 
n
 
[C20: from oestrus + -gen]
 
oestrogenic or estrogen
 
adj
 
estrogenic or estrogen
 
adj
 
oestro'genically or estrogen
 
adv
 
estro'genically or estrogen
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

estrogen
coined 1927 from estrus + -gen "producing."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

estrogen es·tro·gen or oes·tro·gen (ěs'trə-jən)
n.
Any of several natural or synthetic substances formed by the ovary, placenta, testis, and certain plants, that stimulate the female secondary sex characteristics, exert systemic effects such as the growth and maturation of long bones, and are used to treat disorders due to estrogen deficiency and to ameliorate cancers of the breast and prostate. Also called estrin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
estrogen   (ěs'trə-jən)  Pronunciation Key 
Any of a group of steroid hormones that primarily regulate the growth, development, and function of the female reproductive system. The main sources of estrogen in the body are the ovaries and the placenta. Estrogen-like compounds are also formed by certain plants.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
estrogen [(es-truh-juhn)]

A group of hormones, secreted mainly by the ovaries, that influence the female reproductive system in many ways, notably in preparing the body for ovulation and in the development of female secondary sex characteristics.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
There is a high level of variability and differential ratios in levels of
  estrogen and progesterones in birth control pills.
But it's going to do some things that estrogen doesn't do.
We got word this week that estrogen therapy, which was bad, is good again.
Such effects are more pronounced in females than males, as males start out with
  estrogen but lose the hormone as they develop.
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