Definition of Yggdrasil in English:

Yggdrasil

proper noun

Scandinavian Mythology
  • A huge ash tree located at the center of the earth, with three roots, one extending to Niflheim (the underworld), one to Jotunheim (land of the giants), and one to Asgard (land of the gods)

Origin

From Old Norse yg(g)drasill, apparently from Yggr Odin + drasill horse.

Pronunciation:

Yggdrasil

/-ˌsil//ˈiɡdrəsəl/