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Definition of estrogen noun from the Oxford Advanced American Dictionary

 

estrogen

 noun
noun
NAmE//ˈɛstrədʒən//
 
[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
See the Oxford Advanced Learner's Dictionary entry: estrogen