In Norse mythology, the gigantic world tree that holds up and connects the nine realms of the cosmos.
From Old Norse, likely combining 'yggr' (frightening or eerie) and 'drasil' (horse), though etymology is debated by scholars. The tree appears throughout Norse creation myths and represents cosmic order.
Yggdrasil appears in ancient Norse poems written down in the 1200s but preserve centuries-old oral traditions—discovering that Vikings saw the universe as a living tree is profound!
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