Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Slang A highly intelligent person: "These companies are not hot Silicon Valley startups swarming with Gen-X brainiacs” ( Ronald Henkoff).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a very intelligent and usually studious, erudite person.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. someone who has exceptional intellectual ability and originality

Etymologies

Probably from Brainiac, a highly intelligent villain in DC Comics, blend of brain and maniac.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Blend of brain and maniac coined in the Superman comic book. The term first appeared in Action Comics #438 in July, 1958. (Wiktionary)

Examples

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