Ackshully, "galaxy" (or rather, "galaxias") means "Milky Way" already, it's just a translation. It was less ambiguous when the only galaxy we could see was the Milky lights that covered a lot of our sky.
Of course, we realize there's more than one galaxy now, so the meanings have diverged.
I'd heard of that as Hanlon's razor:
Edit: Hanlon, not Hanson