(in folklore and superstition) a human being who has changed into a wolf, or is capable of assuming the form of a wolf, while retaining human intelligence.
Legendary human beings who are magically transformed into wolves. Werewolves supposedly prowl at night, devouring babies and digging up corpses, and cannot be killed with ordinary weapons. They are particularly associated with the full moon.
late O.E. werewulf "person with the power to turn into a wolf," from wer "man" + wulf (see wolf; also see here for a short discussion of the mythology). The first element probably is from PIE *uiHro "freeman" (cf. Skt. vira-, Lith. vyras, L. vir, O.Ir. fer, Goth. wair). Cf. M.Du. weerwolf, O.H.G. werwolf, Swed. varulf. In the ancient Persian calendar, the eighth month (October-November) was Varkazana-, lit. "(Month of the) Wolf-Men."