oestrogens (estrogens)

(redirected from oestrogens estrogens)

oestrogens (estrogens)

a group of steroid hormones produced mainly by the ovaries (predominantly in the first half of the menstrual cycle) and during pregnancy by the placenta; also in small amounts by the testes, and by the adrenal cortex in both sexes. Responsible for female secondary sexual characteristics and the development and function of the female reproductive system. Used in the combined oral contraceptive and in hormone replacement therapy. See also hormones, menstrual cycle.