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Usually, brain waves. Medicine/Medical. electrical potentials or impulses given off by brain tissue.
Compare alpha rhythm, beta rhythm, delta rhythm.
Informal. a sudden idea or inspiration; brainstorm.
Historical Examples

Boon, The Mind of the Race, The Wild Asses of the Devil, and The Last Trump; Herbert George Wells
Somehow Good William de Morgan
The Rough Road William John Locke
When Ghost Meets Ghost William Frend De Morgan
The Girl on the Boat Pelham Grenville Wodehouse
Mrs. Bindle Hebert Jenkins
Punch, or the London Charivari, Vol. 158, March 17, 1920 Various
My Man Jeeves P. G. Wodehouse
The Twins of Suffering Creek Ridgwell Cullum

any of the fluctuations of electrical potential in the brain as represented on an electroencephalogram. They vary in frequency from 1 to 30 hertz See also alpha rhythm, beta rhythm, delta rhythm


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