Bifrost is rainbow that connects earth(Midgard)with Heaven(Asgard) that the Æsir uses as transportation(except for Thor,who wades the three waters of Körmt,Örmt&Kerlaugar"Kettle bath"to get to the holy well of Urdaburnnr"Urda well"The entomology of Bifrost is not really known. It thought to mean"Trembling or Shaking rainbow".
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