madman

[mad-man, -muhn]
noun, plural madmen [mad-men, -muhn] .
a person who is or behaves as if insane; lunatic; maniac.

Origin:
1300–50; Middle English madd man. See mad, man1

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World English Dictionary
madman (ˈmædmən)
 
n , pl -men
a man who is insane, esp one who behaves violently; lunatic

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

madman
late 14c., from mad + man (n.). One word from 16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Even a month with a self-appointed madman can make everyone else slightly
  insane.
And now that land has become a madman's torture chamber.
The madman's loss of reason reflects the terror of a loss of order or community
  in the fragile, tentative little society itself.
In the hand of a carpenter a hammer can build a house, and in the hand of a
  madman it can stave in a skull.
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