brainiacPronunciation: /ˈbreɪnɪak/Definition of brainiac noun North American informal an exceptionally intelligent person: she’s the original brainiac, a kid who completed high school at 14Origin: 1950s: from the name of a supremely intelligent alien character in the Superman comic strip, from a blend of brain and maniacbrainiac in other Oxford dictionaries Definition of brainiac in the US English dictionary
