Definition of brainiac in English:

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Pronunciation: /ˈbreɪnɪak/


North American informal
An exceptionally intelligent person: she’s the original brainiac, a kid who completed high school at 14
More example sentences
  • Can you please tell the brainiacs and intellectuals that not everyone is a walking dictionary?
  • I'll tell you what, you goddamn egghead brainiacs at NASA: I don't want a space elevator.
  • Here's what the brainiacs on the editorial board of The World's Greatest Newspaper can't understand.


1950s: from the name of a supremely intelligent alien character in the Superman comic strip, from a blend of brain and maniac.

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