Yggdrasill

In Norse mythology, the world tree.

One of its roots extended into the underworld, another into the land of the giants, and the third into Asgard. At its base were three wells: the Well of Fate, from which the tree was watered by the Fates; the Roaring Kettle, in which dwelt Nidhogg, the monster that gnawed the tree's roots; and Mimir's Well, the source of wisdom, for whose water Odin sacrificed an eye. After the Ragnarok, Yggdrasill, though badly shaken, is to be the source of new life.

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▪ Norse mythology

Old Norse  Mimameidr 

      in Norse mythology, the world tree, a giant ash supporting the universe. One of its roots extended into Niflheim, the underworld; another into Jötunheim, land of the giants; and the third into Asgard, home of the gods. At its base were three wells: Urdarbrunnr (Well of Fate), from which the tree was watered by the Norns (the Fates); Hvergelmir (Roaring Kettle), in which dwelt Nidhogg, the monster that gnawed at the tree's roots; and Mímisbrunnr (Mimir's Well), source of wisdom, for the waters of which Odin sacrificed an eye. After Ragnarök (q.v.; Doomsday), the world tree, though badly shaken, was to be the source of new life.

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