grey matter
Britishnoun
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Technical name: substantia grisea. the greyish tissue of the brain and spinal cord, containing nerve cell bodies, dendrites, and bare (unmyelinated) axons Compare white matter
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informal brains or intellect
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"Our study shows that individuals carrying certain AQP4 variants showed faster grey matter loss when they reported shorter sleep," researcher Dr. Ayeisha Milligan Armstrong said.
From Science Daily ● Jul. 31, 2026
Deep within the grey matter is plumbing called the glymphatic system.
From BBC ● Jul. 19, 2026
There will be a small amount of fluctuation in every person's grey matter over time, but these results with a dip of nearly 5% are unexpected, Carmona says.
From BBC ● Mar. 4, 2026
Researchers found reduced grey matter volume in several important brain regions among women who had gone through menopause.
From Science Daily ● Feb. 7, 2026
The grey matter of the pons is scattered irregularly through its substance, and appears on its posterior surface; but not on the anterior surface, composed exclusively of the superficial transverse fibres.
From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" by Various
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
