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From The Collaborative International Dictionary of English v.0.48:
Werewolf \Were"wolf`\, n.; pl. Werewolves. [AS. werwulf; wer a man + wulf a wolf; cf. G. w[aum]rwolf, w[aum]hrwolf, wehrwolf, a werewolf, MHG. werwolf. [root]285. See Were a man, and Wolf, and cf. Virile, World.] A person transformed into a wolf in form and appetite, either temporarily or permanently, whether by supernatural influences, by witchcraft, or voluntarily; a lycanthrope. Belief in werewolves, formerly general, is not now extinct. [1913 Webster] The werwolf went about his prey. --William of Palerne. [1913 Webster] The brutes that wear our form and face, The werewolves of the human race. --Longfellow. [1913 Webster] Werk