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Noun: brainiac  brey-nee-ak
Usage: N. Amer
  1. Someone who has exceptional intellectual ability and originality
    "Mozart was a child brainiac";
    - genius, mastermind, brain, Einstein, brainbox [Brit], smart cookie [N. Amer]

Derived forms: brainiacs

Type of: intellect, intellectual

Encyclopedia: Brainiac