Diethylstilbestrol is a synthetic estrogen that was commonly used to treat medical conditions like menopausal symptoms and some types of cancer. However, it was later discovered that diethylstilbestrol could lead to serious health problems, such as an increased risk of breast cancer and reproductive issues. Because of this, the drug is no longer used in medical treatment. Some synonyms for diethylstilbestrol include stilboestrol, steroid hormone, and estrogen. It is important to note that while these terms may be used in a medical context, they should not be used to refer to the drug outside of professional medical settings.