In Norse mythology, Nidhogg ("tearer of corpses") was the monster that ate the roots of the World Tree, Yggdrasil and swore at the eagle living in the tree's branches. Nidhogg also ate corpses.
... or royal family.
Of the more specific uses of the term, the most common include:
1. A supporter of King Charles I of England during the English Civil War.
2. In the ...