Estrogen (Topical Term)

Effects of trace organics on fish, phase 2: p. 9 (Whilst the identity of the oestrogens in sewage effluent ... the synthetic oestrogen present in the contraceptive pill)

Web. 3 (Estrogen also oestrogen: a sex hormone (as estradiol, estriol, estrone) produced esp. in the ovaries and usu. characterized by its ability to promote estrus)

Black's med. dict., 1992: p. 422 (Oestrogen is the term applied to any substance that will induce oestrus or "heat")