/ˈiːstrədʒən; ˈɛstrə-/
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

see estrogen.

oestrogen oes·tro·gen (ěs’trə-jən)
Variant of estrogen.

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  • Oestrone

    /ˈiːstrəʊn; ˈɛstrəʊn/ noun 1. a weak oestrogenic hormone secreted by the mammalian ovary and having the same medical uses as oestradiol. Formula: C18H22O2

  • Oestrous

    [es-truh s, ee-struh s] /ˈɛs trəs, ˈi strəs/ adjective 1. .

  • Oestrous cycle

    noun 1. a hormonally controlled cycle of activity of the reproductive organs in many female mammals. The follicular stage (growth of the Graafian follicles, thickening of the lining of the uterus, secretion of oestrogen, and ovulation, is succeeded by the luteal phase (formation of the corpus luteum and secretion of progesterone), followed by regression and […]

  • Oestrus

    [es-truh s, ee-struh s] /ˈɛs trəs, ˈi strəs/ noun 1. . /ˈiːstrəs; ˈɛstrəs/ noun 1. a regularly occurring period of sexual receptivity in most female mammals, except humans, during which ovulation occurs and copulation can take place; heat n. see estrus. oestrus oes·trus (ěs’trəs) n. Variant of estrus.

  • Oeta

    original estimated time of arrival

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