meg·a·lo·ma·ni·ac

[meg-uh-loh-mey-nee-ak]
noun
1.
a person afflicted with megalomania.
adjective
2.
Also, meg·a·lo·ma·ni·a·cal of, pertaining to, or suggesting megalomania or a person who is afflicted with it.

Origin:
1885–90; megalo- + maniac

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
megalomania (ˌmɛɡələʊˈmeɪnɪə) [Click for IPA pronunciation guide]
 
n
1.  a mental illness characterized by delusions of grandeur, power, wealth, etc
2.  informal a lust or craving for power
 
megalo'maniac
 
adj, —n
 
megalomaniacal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Megalomaniac has a plethora of syllables.
So is cyclotrimethylenetrinitramine. Does it mean:
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
Etymonline
Word Origin & History

megalomaniac
1890 (n.), 1899 (adj.), from megalomania (q.v.).
"The megalomaniac differs from the narcissist by the fact that he wishes to be powerful rather than charming, and seeks to be feared rather than loved. To this type belong many lunatics and most of the great men of history." [Bertrand Russell]
Related: Megalomaniacal.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
When things are going well, a board will generally put up with an
  unco-operative megalomaniac.
Where there was one megalomaniac in power, there is now a myriad of
  power-brokers.
And much of the rest is going on state-driven projects, reinforcing the state's
  rent-seeking or megalomaniac proclivities.
In any case, those stories were never quite as megalomaniac as he seems to
  think.
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