Transsex, also known as Transexual/Transsexual is a sex label to refer to someone whose current or desired sex characteristics doesn’t match their natural sex characteristics. This may include, differing genitals, gonads, or other secondary sex characteristics. A transsex person either has changed some or all sex characteristics, or desires to change these characteristics, typically through hormone replacement therapy, or sex reassignment surgery. Transsex people may also be considered altersex.
Transsex is not the same as transgender. Transgender people who don’t plan to physically transition would not be considered transsex. Additionally, not all transsex people are transgender.
The opposite of transsex is cissex.