Berserk Definition
 bər-sûrk, -zûrk, bə- 
    adjective
  
 Destructively or frenetically violent.
 A berserk worker who started smashing all the windows.
 American Heritage 
In or into a state of violent or destructive rage or frenzy.
 Webster's New World 
Mentally or emotionally upset; deranged.
 Berserk with grief.
 American Heritage 
Unrestrained, as with enthusiasm or appetite; wild.
 Berserk over chocolates.
 American Heritage 
Injuriously, maniacally, or furiously violent or out of control.
 Wiktionary 
    noun
  
 One that is violent, upset, or unrestrained.
 American Heritage 
A berserker.
 Webster's New World 
A crazed Norse warrior who fought in a frenzy.
Wiktionary 
Synonyms: 
  Other Word Forms of Berserk
Noun
Singular:
 berserkPlural:
 berserksOrigin of Berserk
-  Old Norse berserkr (Icelandic berserkur), probably from bjǫrn (“bear”) + serkr (“coat”). Compare sark. From Wiktionary 
- Back-formation from berserker - From American Heritage Dictionary of the English Language, 5th Edition 
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