megalomaniac

[meg-uh-loh-mey-nee-ak]
noun
1.
a person afflicted with megalomania.
adjective
2.
Also, megalomaniacal [meg-uh-loh-muh-nahy-uh-kuhl] , megalomanic [meg-uh-loh-man-ik] . of, pertaining to, or suggesting megalomania or a person who is afflicted with it.

Origin:
1885–90; megalo- + maniac

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
megalomania (ˌmɛɡələʊˈmeɪnɪə)
 
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
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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
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Example sentences
In any case, those stories were never quite as megalomaniac as he seems to
  think.
When things are going well, a board will generally put up with an
  unco-operative megalomaniac.
The authors depict him as a delusional megalomaniac.
And much of the rest is going on state-driven projects, reinforcing the state's
  rent-seeking or megalomaniac proclivities.
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