What does the word troll mean?

Usage examples for troll

  1. One of them had been taken away by a Troll to his castle, which was six miles off, and the other had been carried off to a castle which was nine miles farther off still. – The Red Fairy Book by Various
  2. It will be better for you to depart at once, for a Troll lives here who has six heads. – The Red Fairy Book by Various