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[mon-uh-mey-nee-uh, -meyn-yuh] /ˌmɒn əˈmeɪ ni ə, -ˈmeɪn yə/
(no longer in technical use) a psychosis characterized by thoughts confined to one idea or group of ideas.
an inordinate or obsessive zeal for or interest in a single thing, idea, subject, or the like.
Origin of monomania
1815-25; < New Latin; see mono-, -mania
Related forms
[mon-uh-mey-nee-ak] /ˌmɒn əˈmeɪ niˌæk/ (Show IPA),
[mon-uh-muh-nahy-uh-kuh l] /ˌmɒn ə məˈnaɪ ə kəl/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for monomaniac
Historical Examples
  • You shall accept him, she repeated with the insistence of a monomaniac.

  • "I shall not say anything," said the monomaniac, with a wonderful and peaceful face.

  • In the first place, he gradually became almost a monomaniac upon the question of money.

    Swift Leslie Stephen
  • "She is a monomaniac on the subject, I should imagine," observed Albert.

    Uncle Terry Charles Clark Munn
  • The general opinion of the country had been, all along, that he was a monomaniac, attempting an impossibility.

    Peter Parley's Own Story Samuel G. Goodrich
  • Would not his neighbors regard him as a monomaniac or a simpleton?

  • Even if he is now, or was then, a monomaniac, can the deed in question be traceable to his monomania as to its real cause?

  • The elder girl, of about eighteen, was almost a monomaniac upon the war.

    The Secret Service. Albert D. Richardson
  • I suppose you will say I am a monomaniac at the very least; but I'm going to tell you what it is that has been slowly killing me.

    Old Friends and New Sarah Orne Jewett
  • "You are just a monomaniac, Rowley, my old man," said Mrs. Morgan.

    Hester, Volume 2 (of 3) Margaret Oliphant
British Dictionary definitions for monomaniac


an excessive mental preoccupation with one thing, idea, etc
Derived Forms
monomaniac, noun, adjective
monomaniacal (ˌmɒnəʊməˈnaɪəkəl) adjective
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
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Word Origin and History for monomaniac

1833; see monomania + maniac. Related: Monomaniacal.



"insanity in regard to a single subect or class of subjects," 1820, probably on model of earlier French monomanie, from Modern Latin monomania, from Greek monos "single, alone" (see mono-) + mania (see mania).

Online Etymology Dictionary, © 2010 Douglas Harper
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monomaniac in Medicine

monomania mon·o·ma·ni·a (mŏn'ə-mā'nē-ə, -mān'yə)
Pathological obsession with one idea or subject, as in paranoia.

mon'o·ma'ni·ac' (-mā'nē-āk') n.
mon'o·ma·ni'a·cal (-mə-nī'ə-kəl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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