
1) Demon wolf of Norse mythology 2) Moon of Saturn 3) Mythical being 4) Mythological monster 5) Wolf of Norse myth 
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https://www.crosswordclues.com/clue/fenrir

 In Norse mythology, Fenrir (Old Norse: `fen-dweller`), Fenrisúlfr (Old Norse: `Fenris wolf`), Hróðvitnir (Old Norse: `fame-wolf`), or Vánagandr (Old Norse: `the monster of the river Ván`) is a monstrous wolf. Fenrir is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda and He...
Found on 
http://en.wikipedia.org/wiki/Fenrir
 [moon]
[moon]  Fenrir (ɪər {respell|FEN|reer}) or Saturn XLI (provisional designation S/2004 S 16) is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on May 4, 2005, from observations taken between December 13, 2004, and March 5, 2005. Fenrir has an apparent magnit...
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http://en.wikipedia.org/wiki/Fenrir_(moon)

monstrous wolf of Norse mythology. He was the son of the demoniac god Loki and a giantess, Angerboda. Fearing Fenrir`s strength and knowing that only ... [3 related articles]
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http://www.britannica.com/eb/a-z/f/17

Wolf; offspring of Loki; swallows Odin at Ragnarok and is slain by Vitharr.
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http://www.factmonster.com/ipka/A0197623.html

Gigantic wolf
Found on 
http://www.mythical-creatures-and-beasts.com/mythical-creatures.html

[
n] - (Norse mythology) an enormous wolf that was fathered by Loki and that killed Odin
Found on 
http://www.webdictionary.co.uk/definition.php?query=Fenrir
 noun
 noun (Norse mythology) an enormous wolf that was fathered by Loki and that killed Odin
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https://www.encyclo.co.uk/local/20974
  No exact match found.