Ásatrú (Icelandic, "Æsir faith") is a modern revival of the pre-Christian Nordic religion as described in the Norse epic Eddas.
Ásatrú is an Old Norse word consisting of Ása, referring to the Norse gods, and trú, "troth" or "faith". Thus, Ásatrú means "religion of the Æsir." The term was coined by Edvard Grieg in his 1870 opera Olaf Trygvason, in the context of 19th century romantic nationalism.
Generally synonymous terms for Asatru include Germanic Neopaganism, Germanic Heathenism, Forn Sed, Odinism, Heithni or Heathenry.