Jormungandr

The Midgard serpent, "the girdler of all the earth", brother of Fenrir; Thor hooks it with an ox-head from Hymir's boat and strikes it, and it sinks back into the sea; at Ragnarok it writhes "In giant-wrath", Thor kills it and dies of its venom nine paces on. Bellows's spelling is Mithgarthsorm.