Wiktionary
quinestradol
n. A synthetic oestrogen.
Wikipedia
Quinestradol
Quinestradol ( INN, BAN) (brand names Colpovis, Colpovister, Pentovis), or quinestradiol, also known as estriol 3-cyclopentyl ether, is a synthetic estrogen which is no longer used clinically. It has been studied in the treatment of stress incontinence in elderly women with efficacy observed.