In Norse mythology, a monstrous wolf.
He was the son of the god Loki and a giantess. The gods bound Fenrir to a rock with a magical chain, where he is destined to remain until doomsday, or Ragnarok , when he will break his chains and fall upon the gods. In one version of the myth, he will devour the sun and swallow the chief god, Odin , only to be slain by Vidar, Odin's son. Fenrir figures prominently in Norwegian and Icelandic poetry of the 10th11th century.