(n)one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury, Syn.berserk
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
{ } n. [ Icel. berserkr. ] 1. (Scand. Myth.) One of a class of legendary heroes, who fought frenzied by intoxicating liquors, and naked, regardless of wounds. Longfellow. [ 1913 Webster ]
2. One who fights as if frenzied, like a Berserker. [ 1913 Webster ]