from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Someone who can change their skin at will, especially into that of a wolf; a werewolf.
But the belief that men under certain conditions could also take the shape of animals is primaeval. . . .The Latins called such a man a turnskin -- versipellis, an expression which exactly agrees with the Icelandic expression for the same thing, and which is probably the true original of our turncoat.
I felt that he was a turnskin, and I could never after taste bread with him, not if you would have killed me.