See gonadotropin in American Heritage Dictionary 4
(gō-nădˌə-trōˈpĭn, -trŏpˈĭn) also go·nad·o·tro·phin(-trōˈfĭn, -trōˈpĭn)
noun
A hormone that stimulates the growth and activity of the gonads, especially any of several pituitary hormones that stimulate the function of the ovaries and testes.