ber·serk

[ber-surk, -zurk]
adjective
1.
violently or destructively frenzied; wild; crazed; deranged: He suddenly went berserk.
noun
2.
( sometimes initial capital letter ) Scandinavian Legend.. Also, ber·serk·er. an ancient Norse warrior who fought with frenzied rage in battle, possibly induced by eating hallucinogenic mushrooms.

Origin:
1865–70; < Old Norse berserkr, equivalent to ber- (either *ber-, base of bjǫrn bear2 or berr bare1) + serkr sark, shirt, armor

ber·serk·ly, adverb
ber·serk·ness, noun


1. violent, mad, maniacal, rabid, demented, lunatic.


1. rational, calm.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Berserk is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
berserk (bəˈzɜːk, -ˈsɜːk) [Click for IPA pronunciation guide]
 
adj
1.  frenziedly violent or destructive (esp in the phrase go berserk)
 
n
2.  Also called: berserker a member of a class of ancient Norse warriors who worked themselves into a frenzy before battle and fought with insane fury and courage
 
[C19: Icelandic berserkr, from björn bear + serkr shirt]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

berserk
"Norse warrior," 1822, introduced by Sir Walter Scott, from O.N. berserkr (n.) "raging warrior of superhuman strength," probably from *ber- "bear" + serkr "shirt," thus lit. "a warrior clothed in bearskin." The -r was O.N. masc. singular ending, mistaken for agent noun suffix. The adj. is 1867, from
such phrases as go berserk.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When the stock market lurches and online traders go berserk, brokerage sites
  can hardly afford to buckle.
Althea went berserk and threw the torch into the fire.
People capable of resigning their intelligence this way can be expected to go
  berserk anytime, anywhere.
When those people come home from work, my dogs go berserk barking.
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