Etymology
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berserker (n.)

alternative form of berserk (q.v.), from Old Norse berserkr, accusative of berserk. This is the oldest form of the word in its revival in Modern English (1822).

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Definitions of berserker

berserker (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;
Synonyms: berserk
From wordnet.princeton.edu