Webster's Revised Unabridged Dictionary · 1913

Werewolf

Werewolf , noun

[Anglo-Saxon werwulf; wer a man + wulf a wolf; compare German warwolf, wahrwolf, wehrwolf, a werewolf, Middle High German werwolf. r285. See Were a man, and Wolf, and compare 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.
The werwolf went about his prey. — William of Palerne
The brutes that wear our form and face, The werewolves of the human race. — Longfellow