American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
It was in junior high that he fell in with a problem crowd, after being teased for being a "brainiac," for belonging to math and chess clubs.— zanesvilletimesrecorder.com - Local News
Who Wants to Be a Millionaire and comes off like a brainiac.— Rolling Stone : Rock and Roll Daily
Is Sarah Palin so very different from liberal "brainiac" journalists believe a politician should be like that they have to comb through her personal life in search of all the details that shout that she would not fit in at their cocktail parties?— Hyscience
I'm not a brainiac, I'm not a security buff, most of the material was somewhat new to me and reading for those 3 days was my first exposure.— CertCities.com | IT Forums
Can things possibly get any worse for the brainiac billionaire?— Fool.com: The Motley Fool

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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