Definition of brainiac noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈbreɪniæk//
; NAmE NAmE//ˈbreɪniæk//
(North American English, informal)
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a very intelligent person A team of brainiacs are here to answer your scientific questions. Brainiacs from around the world take part in the contest. From the name of a character in the Superman stories.
See the Oxford Advanced American Dictionary entry: brainiac