Well, this is a conundrum then. You can't just create new syntax in languages that don't support a way to extend the syntax (see Lisp macros, and I even get to mention TCL here). So, most of what we normally call "DSLs," (i.e. method chaining languages, overloading operators) aren't.
So, I guess we should start calling them Domain Specific APIs--DSAPIs, if you will.
I don't call these things DSLs. Other people might.
Other people do. Maybe it's not the proper terminology, but it's too common to ignore it.