noun Scandinavian Mythology.

Heimdall's horn, used to warn the gods of Ragnarok.

Origin of Gjallar-horn

< Old Norse, equivalent to gjallar, genitive singular of gjǫll noise, din (Compare gjalla to resound loudly, scream; cognate with Old English g(i)ellan to yell) + horn horn
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gjallarhorn

Historical Examples of gjallarhorn

  • He has a trumpet called the Gjallarhorn, and when he blows it it can be heard in all the worlds.