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
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Historical Examples of gjallar-horn