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Definition of oestrogen noun from the Oxford Advanced Learner's Dictionary

 

oestrogen

 noun
(British English) (North American English estrogen) noun
BrE BrE//ˈiːstrədʒən//
 
; NAmE NAmE//ˈestrədʒən//
 
[uncountable]
 
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a hormone produced in women’s ovaries that causes them to develop the physical and sexual features that are characteristic of females and that causes them to prepare their body to have babies compare progesterone, testosterone Word Origin 1920s: from oestrus (from Greek oistros ‘gadfly or frenzy’) + -gen.

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