plural brain waves
Definition of brain wave
1a
: rhythmic fluctuations of voltage between parts of the brain resulting in the flow of an electric current
b
: a current produced by brain waves
2
: a flash of inspiration : brainstorm sense 1a
We invited the Hill Holliday ad agency in Boston to collaborate on our cover shoot, and its creative director, Lance Jensen, had a brain wave: wouldn't it be eye-catching for our pages to reflect not just the editorial look of the '60s but also the advertising idiom of the time?— Tina Brown
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Merriam-Webster unabridged
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Time Traveler for brain wave
The first known use of brain wave was in 1890
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