Mudblood

[RocketGranny]

No: HPFGUIDX 72867

Hello. Long-time lurker here. I'm stuck, trying to reconcile the
Evans as magical, Potter as non-magical theory. But what if we have 
our definitions wrong? 

Where in cannon does it say that MUDBLOOD means BOTH parents are 
muggles? And if you're a half-blood: one magical parent and one 
muggle parent ... wouldn't this qualify you for the (derogatory) 
mudblood label? 

Magical Parent1 + Magical Parent2 = "pure-blood"
Magical Parent1 + Muggle Parent2 = "mudblood" or "half-blood"
Muggle Parent1 + Muggle Parent2 = "mudblood"