Thank you and another question - Pureblood vs. Halfblood

[Alanna]

No: HPFGUIDX 191428

Hey all! Thanks for the responses to my questions on wolfsbane and portkeys.  They were very helpful.  I have another question now.  I'm having trouble understanding Pureblood vs Halfblood.  I get the Halfblood when one parent is magical and the other isn't as in the case of Voldie and Snape, but why is Harry considered a Halfblood? Both his parents are magical despite his mother being muggleborn.  If he's considered Halfblood because of that, then what would you call the child of two muggleborns?
 
Also, I'm still looking for an answer on the question of fic searches. 
 
Thanks again!
 
Alanna :)