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

brainiac

noun
brainiac pronunciation English ˈbreɪniæk brainiac pronunciation American ˈbreɪniæk
(North American English, informal)
 
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.