A muggle born is a witch/wizard who was born in a muggle family.

A muggle is a person that has no magical abilities.

Muggle-Wump was created in 1978.

Technically she is a muggle born witch. Her parents are muggles. (:

No. Muggle is someone who does not have any magic in their blood and they do not study it. Hermione Granger is a Muggle-born, meaning her parents does not have magic.

Yes.

To be pure-blood, both parents need to have been born by pure-bloods and to be muggle-born both parents need to be muggles. Neither was the case for Harry whose father was a pure-blood and mother was a muggle-born which makes him a half-blood.