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oestrogen

Pronunciation: /ˈiːstrədʒ(ə)n, ˈɛstrə-/

(US estrogen)

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Definition of oestrogen

noun

any of a group of steroid hormones which promote the development and maintenance of female characteristics of the body. Such hormones are also produced artificially for use in oral contraceptives or to treat menopausal and menstrual disorders: there is a monthly cycle of oestrogens and progesterone