Definition of Zihar Linguistically and in Islamic Law

The Shaykh : Zihar is derived from the word "back" (dhahr). It is when a man likens his wife to a woman who is permanently forbidden to him, meaning he likens his wife in terms of prohibition to a woman who is permanently forbidden to him. For example, if he says, "You are to me like the back of my mother," or "like the back of my mother," or "like my mother" in terms of prohibition. This is Zihar.