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.
Among some participants, sleeping for fewer hours was associated with a faster decline in grey matter.
From Science Daily ● Jul. 31, 2026
One of the areas of grey matter with the most pronounced and persistent changes was the so-called default mode network - which is involved in self-perception, empathy and altruism.
From BBC ● Mar. 4, 2026
While the pregnant women lost an of average nearly 5% of their grey matter, it then partially returned - although not fully - by six months after giving birth.
From BBC ● Mar. 4, 2026
They examined grey matter, which consists of neuron cell bodies and is often described as the brain’s “thinking” tissue.
From Science Daily ● Feb. 19, 2026
The grey matter of the medulla oblongata, which contains numerous multipolar nerve cells, is in part continuous with the grey matter of the spinal cord, and in part consists of independent masses.
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.
