Could your shotgun soon be outlawed?

What’s the definition of a “shotgun?” According to Dictionary.com it’s “a smoothbore gun for firing small shot to kill birds and small quadrupeds, though often used with buckshot to kill larger animals.” For the gun enthusiasts, that’s only partly true, as there is also the option of using slugs. But what if there’s another addition that will soon be added to the definition? How about, illegal.