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monomania

[mon-uh-mey-nee-uh, -meyn-yuh]
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noun
  1. (no longer in technical use) a psychosis characterized by thoughts confined to one idea or group of ideas.
  2. an inordinate or obsessive zeal for or interest in a single thing, idea, subject, or the like.
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Origin of monomania

From New Latin, dating back to 1815–25; see origin at mono-, -mania
Related formsmon·o·ma·ni·ac [mon-uh-mey-nee-ak] /ˌmɒn əˈmeɪ niˌæk/, nounmon·o·ma·ni·a·cal [mon-uh-muh-nahy-uh-kuh l] /ˌmɒn ə məˈnaɪ ə kəl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for monomaniacal

monomania

noun
  1. an excessive mental preoccupation with one thing, idea, etc
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Derived Formsmonomaniac, noun, adjectivemonomaniacal (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

Word Origin and History for monomaniacal

monomania

n.

"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).

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Online Etymology Dictionary, © 2010 Douglas Harper

monomaniacal in Medicine

monomania

(mŏn′ə-mānē-ə, -mānyə)
n.
  1. Pathological obsession with one idea or subject, as in paranoia.
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Related formsmon′o•mani•ac′ (-mānē-ăk′) n.mon′o•ma•nia•cal (-mə-nīə-kəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.