Flash - What's The Definition Name For Fonts Loaded At Runtime Created With Fontswf

I ran into the 'fontswf' utility to embed TTF fonts into SWF and I am struggling to load them at runtime from my app. All the examples I find online refer to loading the font via [Embed] but I am actually loading them with a flash.display.Loader and from what I gather, once the Loader.contentLoaderInfo fires an Event.INIT I need to register the font, like so:

public function handleLoaderComplete( event:Event ):void {
var FontClass:Class = event.target.applicationDomain.getDefinition( fontName );
Font.registerFont( FontClass );
}

The problem is I don't know what to pass in as fontName. I am generating my SWF through:

$ fontswf -a belshaw -o belshaw.swf belshaw.ttf

But when I try to call getDefinition( 'belshaw' ), I get an error saying 'Variable belshaw is not defined'. Any suggestions on how to accomplish this?The alternative is to generate my on SWF files through templating an .as file and compiling them, but I would rather use a built in tool like fontswf if it's already there.