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New American Oxford Dictionary

brainiac

brain i ac |ˈbrānēˌak ˈbreɪniæk | noun informal an exceptionally intelligent person. ORIGIN 1950s: from the name of a superintelligent alien character of the Superman comic strip, from a blend of brain and maniac .

 

Oxford Dictionary

brainiac

brain |iac |ˈbreɪnɪak | noun N. Amer. informal an exceptionally intelligent person. ORIGIN 1950s: from the name of a supremely intelligent alien character in the Superman comic strip, from a blend of brain and maniac .

 

Sanseido Wisdom Dictionary

brainiac

brain i ac /bréɪnɪæ̀k /名詞 C ⦅くだけて おどけて ⦆インテリ, 頭でっかち .