What is a Transsexual???

[Mirya]

The definition of the term "transsexual" is unambiguous. Please see:

I disagree. The definition is actually very ambiguous, and probably intentionally so. Much of it is open to interpretation (i.e. open to opinions!)

While they all word it slightly differently, the "Clinical Information" section of the 2019 ICD-10-CM Diagnosis Code F64.0 is the most straightforward:
"Severe gender dysphoria, coupled with a persistent desire for the physical characteristics and social roles that connote the opposite biological sex.

I don't think that definition is straightforward at all. What exactly are female "physical characteristics'? How many "physical characteristics" are needed to qualify? Is it enough to have breasts? Long hair? Or both? Or more? It's so ambiguous! And what exactly are "social roles"? Again, the wording is vague, and open to interpretation.