werewolf

"wolf-man." In popular folklore, a person who is involuntarily transformed into a wolf under the influence of a full moon, or who has the power to change himself into a wolf by means of magic incantations or ointments. The metamorphoses of a werewolf is so complete that the person in question becomes a wolf in appearance and nature. Werewolves are active at night and resume human form in the morning.

It was superstitiously believed that people with meeting eyebrows were either werewolves or vampires.

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