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
A number of studies in teens have suggested a pattern of grey matter thinning through adolescence with a "refining or pruning" of nerve networks as brains mature.
From BBC ● Mar. 4, 2026
Brain imaging revealed that women who were post-menopause showed significant reductions in grey matter volume, regardless of whether they had used HRT.
From Science Daily ● Feb. 7, 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 pons consists of white and grey matter: the nerve fibres of the white matter pass through the substance of the pons, in either a transverse or a longitudinal direction.
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.
