Etymology
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brainiac (n.)

"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.

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Definitions of brainiac

brainiac (n.)
someone who has exceptional intellectual ability and originality;
Synonyms: genius / mastermind / brain / Einstein
From wordnet.princeton.edu