noun
also oes·tro·gen ˈestrəjə̇n, -ˌjen
( -s )
Etymology: International Scientific Vocabulary estro-, oestro- (from New Latin estrus, oestrus ) + -gen
: a sex hormone (as estradiol, estriol, estrone) produced especially in the ovaries and usually characterized by its ability to promote estrus and stimulate the development of secondary sex characteristics in the female ; also : a substance occurring naturally in plants or made synthetically (as benzestrol or diethylstilbestrol) that has similar biological activity — compare androgen