megalomania (n.)youdaoicibaDictYouDict[megalomania 词源字典]
"delusions of greatness," 1866, from French mégalomanie; see megalo- + mania "madness."[megalomania etymology, megalomania origin, 英语词源]
megalomaniacyoudaoicibaDictYouDict
1882 (n.), 1883 (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, "The Conquest of Happiness"]
megalomaniacal (adj.)youdaoicibaDictYouDict
1884, from megalomaniac + -al (1).