One who has changed or is in the process of changing his/her physical sex by undergoing medical treatment such as hormone replacement therapy (HRT) and/or sex reassignment surgery (SRS)
He was wearing women’s clothes before he had the surgery; then, he actually became a transsexual, and they (amazingly) stayed together.
A transsexual is a person who has decided that they want to live as a person of the opposite sex, and so has changed their name and appearance in order to do this. Transsexuals sometimes have an operation to change their sex. a man who wants to be a woman and has medical treatment to make him into one, or a woman who wants to be a man and has medical treatment to make her into one transvestite
A person who identifies as a gender different from that which they were assigned at birth, as well as maintains the need for a physical sex at variance with their biological one. Transsexuals often correct their anatomy to better conform to their gender identity, mainly through hormonal and surgical techniques