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

Derived forms: brainboxes

Type of: intellect, intellectual

Encyclopedia: Brainbox