Pronunciation: (es'trē-ôl", -ol", -trī-), [key]
1. Biochem.an estrogenic hormone, C18H21(OH)3, occurring in urine during pregnancy.
2. Pharm.a commercial form of this compound, obtained from human placentas or the urine of pregnant women, used in conditions involving estrogen deficiency.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.