/es"tree awl', -ol', -truy-/ , n.
1. Biochem. an estrogenic hormone, C 18 H 21 (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.
[ 1930-35; ES(TRIN) + TRI- + -OL 1 ]