brain-wave

brain wave

noun
1.
Usually, brain waves. Medicine/Medical. electrical potentials or impulses given off by brain tissue. Compare alpha rhythm, beta rhythm, delta rhythm.
2.
Informal. a sudden idea or inspiration; brainstorm.

Origin:
1865–70

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

brain wave n.
A rhythmic fluctuation of electric potential between parts of the brain, as seen on an electroencephalogram.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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