noun
also oes·tra·di·ol ˌestrəˈdīˌȯl, -īˌōl
( -s )
Etymology: International Scientific Vocabulary estra-, oestra- (from estrin, oestrin ) + -diol
: a white crystalline highly estrogenic hormone that is a phenolic steroid alcohol C 18 H 24 O 2 found especially in the follicular fluid of the ovary and in the urine of pregnant mares but is usually made synthetically (as from estrone by reduction or indirectly from cholesterol) and that is often used in the form of esters especially in treating menopausal symptoms