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[brey-nee-ak] /ˈbreɪ niˌæk/ Slang.
a highly intelligent person.
Origin of brainiac
from Brainiac, a superintelligent, villainous alien in the Superman comics, probably brain + (man)iac Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for brainiac


(informal) a highly intelligent person
Word Origin
C20: from a super-intelligent character in an American comic strip
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for brainiac

"very smart person," 1982, U.S. slang, from brain (n.) + ending from ENIAC, etc. Brainiac also was the name of a comic book villain in the Superman series and a do-it-yourself computer building kit, both from the late 1950s, and the word may bear traces of either or both of these.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for brainiac



: since you've been quoting every rainia dumb-dumb to make your points


  1. An intelligent person; brain: Hugo is such a rainia he got 100% on the algebra test
  2. An intellectual; double dome, egghead

[1980s+; fr a smart and nasty character in the Superman comics]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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