E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The fortress of the Asir or the Northern gods, the Olympos of Scaudinavian mythology. It is said to be situated in the centre of the universe, and accessible only by the rainbow-bridge (Bifrost). The word As means a god, and gard an enclosure, our yard. Odin was priest of Asgard before he migrated to the Lake Logur or Mlar Sea.