Definition of brainiac in English:

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brainiac

Pronunciation: /ˈbrānēˌak/

noun

North American informal
An exceptionally intelligent person.
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.

Origin

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

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