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Jormungandr (also Jormungand) is the Midgard Serpent of Norse mythology, a child of Loki so huge that it lies around the whole world and bites its own tail. It is Thor's great enemy: at Ragnarok they kill each other.
What is Jormungandr?
Jormungandr, the Midgard Serpent, is another monstrous child of Loki and Angrboda. Odin cast it into the great ocean that encircles Midgard, where it grew until it wrapped around the entire world and could grasp its own tail — earning it the name World Serpent.
Jormungandr and Thor
The serpent is Thor's great adversary. Once, at the giant Hymir's, Thor hooked it while fishing and hauled its head from the sea, only for the terrified giant to cut the line. They are fated to meet a final time at Ragnarok: Thor will crush the serpent's skull with Mjollnir, but its venom will spread through him, and after nine steps the thunder-god will fall dead. Serpent and thunderer end together.
Its enemy is Thor, its father is Loki, and their fight comes at Ragnarok.
Questions
What does Jormungandr mean?
It is usually read as "great monster". It is also called the Midgard Serpent and the World Serpent.
Who are Jormungandr's parents?
Loki and the giantess Angrboda. Its brother is the wolf Fenrir and its sister is Hel.
Who kills Jormungandr?
Thor, at Ragnarok. He crushes its head with Mjollnir, then takes nine steps and falls dead from its venom.