berserk
1. [ noun ] (Scandinavian) one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury
Synonyms: berserker
Related terms: Scandinavian
2. [ adjective ] in a murderous frenzy as if possessed by a demon
Synonyms: amok demoniac demoniacal possessed amuck
Examples:

"the soldier was completely amuck" "berserk with grief" "a berserk worker smashing windows"

Related terms: insane
Similar spelling:   berserker
  bear's_ear
  Berger
  Bergeron
  Bercier
  Bergerson