1) Estradiol 2) Estrogen 3) Oestrogen 1) Estradiol 
A hormone (272 D) synthesised mainly in the ovary, but also in the placenta, testis and possibly adrenal cortex. A potent oestrogen. ... (18 Nov 1997) ... 
Oestradiol is a female sex hormone of importance during the menstrual cycle and pregnancy. It plays a role in the development of typical female body characteristics such as the formation of breasts, soft skin, sexual organs and the pattern of fat distribution. It has high oestrogenic activity as a sex hormone
(= estradiol (USA); follicular hormone) A hormone (272 D) synthesized mainly in the ovary, but also in the placenta, testis, and possibly adrenal cortex. A potent oestrogen.
Type: Term Pronunciation: es′tră-dī′ol Synonyms: estradiol