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madman

[mad-man, -muh n]
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noun, plural mad·men [mad-men, -muh n] /ˈmædˌmɛn, -mən/.
  1. a person who is or behaves as if insane; lunatic; maniac.
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Origin of madman

First recorded in 1300–50, madman is from the Middle English word madd man. See mad, man1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for madman

madman

noun plural -men
  1. a man who is insane, esp one who behaves violently; lunatic
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for madman

n.

early 14c., mad man, from mad (adj.) + man (n.). One-word form attested from c.1400, prevalent from 16c.

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Online Etymology Dictionary, © 2010 Douglas Harper