Blizzard considers the following *defense*

Ghost wolf
Stoneskin Totem
Stoneclaw totem
Stoneclaw totem (glyphed)
All our resistance totems
The ability to self-heal (cuz 5k HW's for enhancement is extremely powerful)
Grounding Totem
Earthbind Totem
Wind Shear (yes becauses slowing someone down slightly longer then one GCD is very powerful)
Frost Shock
Mail Armor+shield (which is supposed to help enhancement as well)


So if we follow Blizzard's qualification for defense, WE'RE LOADED!!!!1