[n] synthetic nonsteroid with the properties of estrogen; formerly used to treat menstrual problems but was found to be associated with vaginal cancers in the daughters of women so treated during pregnancy
[n] a potent estrogen used in medicine and in feed for livestock and poultry
A synthetic estrogen (originally prescribed to prevent miscarriage) that caused malformations of the reproductive organs in some who were exposed to the drug during fetal development.
WordNet Dictionary