The storm with violent wind must be a closed-system tropical storm, otherwise it can't technically be called a hurricane.

A wind of force 12 isn't a hurricane. It IS a hurricane-force wind. A hurricane is a tropical storm system with a particular three-dimensional structure, organised thunderstorms, heavy rain....and winds of at least force 12.

You're supposed to be a scientist, yet here you are arguing in favour of lack of precision in a pretty simple matter. I'm fine with people using terms informally in order to communicate ideas. But we are focusing here, for better or worse, on the proper use of the term. As such, as a scientist you should be encouraging accuracy. Not demanding it, but encouraging it, and certainly not arguing against it. You do appear to have penchant for indulging in the cult of the philistine.   

And argument from authority, aka appeal to authority, is a well-known logical fallacy. As meteorology has been my passion since my age was in single figures, and I'm now an old age pensioner, it's a fair bet (not a dead cert - Humility is my middle name) that I know more about tropical storms, etc., than the average dictionary compiler. Your fallacy is that you set out to choose "authoritative" sources that suit your predetermined point of view. It's a lamentably common phenomenon on this forum.