brainiac

brainiac

[brey-nee-ak] Slang.
noun
a highly intelligent person.

Origin:
from Brainiac, a superintelligent, villainous alien in the Superman comics, probably brain + (man)iac

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World English Dictionary
brainiac (ˈbreɪnɪˌæk)
 
n
informal a highly intelligent person
 
[C20: from a super-intelligent character in an American comic strip]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

brainiac
"very smart person," 1980s U.S. slang, from brain + 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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