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oestrogen

British

/ ˈiːstrədʒən, ˈɛstrə-, ˌiːstrə-, ˌɛstrə- /

noun

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

"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

Other Word Forms

Etymology

Origin of oestrogen

C20: from _oestrus + _-gen

Example Sentences

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See Examples For:

oestrogen

Endometriosis is driven by female hormones - oestrogen and progesterone - linked to the menstrual cycle.

From BBC ● Jul. 7, 2026

Letrozole is a drug used to lower oestrogen levels and is frequently used to treat breast cancer.

From BBC ● Apr. 3, 2026

Falling levels of oestrogen in the body have a knock-on effect on the brain, on periods, skin, muscles and emotions.

From BBC ● Mar. 11, 2026

The scientists collected urine and saliva samples from the women on five occasions and discovered that, in some cases, rising oestrogen levels tracked closely with the reduction in grey matter.

From BBC ● Mar. 4, 2026

We can give you some other pills that will give your body the oestrogen it ought to be producing.

From Identity by Aiko Frikki

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023