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Meaning of Gjallar-horn

Gjal•lar-horn

Pronunciation: (yäl'lär-hôrn"), [key]
— n. Scand. Myth.
  1. Heimdall's horn, used to warn the gods of Ragnarok.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.