megalomaniac

By surface analysis, megalomania +‎ -ac, or, by surface analysis, megalo- +‎ -maniac.

• IPA^(key): /ˌmɛɡəloʊˈmeɪniæk/

• Audio (US):

  (file)

• Rhymes: -eɪniæk

megalomaniac (plural megalomaniacs)

1. One affected with or exhibiting megalomania.
   • 1929, Sir Arthur Conan Doyle, When the World Screamed‎^[1]:

     'Well, I don't know him well enough yet to say, but I will admit that if he is not a mere bullying megalomaniac, and if what he says is true, then he certainly is in a class by himself.'

megalomaniac (comparative more megalomaniac, superlative most megalomaniac)

1. Of, exhibiting, or affected with megalomania.
   • 2013, Jon Huer, Call from the Cave: Our Cruel Nature and Quest for Power, Rowman & Littlefield, →ISBN, page 241:

     Often, for good measure, Hitler is given as an example of a megalomaniac person. So, for our convenience, Hitler personifies the illness called megalomania […]