What is "etynodiol"

alt. A steroidal progestin. n. A steroidal progestin.

Etynodiol ( INN), or ethynodiol ( BAN), is a steroidal progestin which was never marketed. A diacylated derivative, etynodiol diacetate, is used as a hormonal contraceptive.

While etynodiol is sometimes used as a synonym for etynodiol diacetate, what is usually being referred to is actually etynodiol diacetate and not etynodiol.