a synthetic nonsteroidal estrogen ... occurring as a white, crystalline powder, having estrogenic activity similar to but greater than that of estrone. It is used for many purposes, e.g., to relieve menopausal symptoms, to suppress lactation, in amenorrhea, dysmenorrhea, senile vaginitis, and pruritus vulvae, in the palliative treatment of female breast carcinoma, and to relieve the symptoms of prostatic carcinoma; administered orally, intravaginally, or intramuscularly.