| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| oestriol | (noun) a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency | Synonyms: estriol |
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| oestrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: estrogen |
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| oestrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, theelin |
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| oestrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, rut |
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