Rubeus Hagrid: Who was Ron trying to curse, anyway?

Harry Potter: Malfoy. He called Hermione... Well, I don't know exactly what it means.

Hermione Granger: He called me a Mudblood.

Rubeus Hagrid: He did not.

Harry Potter: What's a Mudblood?

Hermione Granger: It means "dirty blood." Mudblood's a really foul name for someone who's Muggle-born. Someone with non-magic parents. Someone like me. It's not a term one usually hears in civilized conversation.

Rubeus Hagrid: See, the thing is, Harry, there are some wizards, like the Malfoy family... who think they're better than everyone else because they're pure-blood.

Harry Potter: That's horrible.

Ron Weasley: It's disgusting.

Rubeus Hagrid: And it's codswallop to boot. Dirty blood. Why, there isn't a wizard alive today that's not half-blood or less. More to the point, they've yet to think of a spell that our Hermione can't do. Come here. Don't you think on it, Hermione. Don't you think on it for one minute.