The hull is the very outer coating and is removed-it's not edible. Brown rice is de-hulled, but has the bran intact.
I'm well versed as I once bought an 8 lb bag that many grains with the hull still on! It's very obvious when cooked, they look just like fennel seeds, and very "woody"! Was a shame too, it was organic from Pakistan and the best rice I've had! Almost worth the trouble of picking out.
Speaking of Pakistan, I have heard that rice grown in that part of the world did not test for arsenic. The U.S. seemed particularly vulnerable.