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white matter
noun
: neural tissue especially of the brain and spinal cord that consists largely of myelinated nerve fibers bundled into tracts, has a whitish color, and typically underlies the cortical gray matter
Examples of white matter in a Sentence
Recent Examples on the Web
Some of the changes, including the reduction in gray matter, remained two years postpartum, while others, such as the white matter increase, were temporary.
—Melissa Willets, Parents, 25 Sep. 2024
More white matter means stronger, better-functioning connections.
—Sarah Jividen, Verywell Health, 3 Oct. 2024
While grey matter decreases, there were significant increases in white matter, the nerve fibres that connect neurons and help different brain regions communicate.
—Chas Newkey-Burden, The Week Uk, theweek, 18 Sep. 2024
Diverse areas can be linked together by edges representing the brain’s structural connections: thick bundles of tubular wires called white matter tracts that tie together brain regions.
—Max Bertolero, Scientific American, 1 July 2019
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Word History
First Known Use
1674, in the meaning defined above
Dictionary Entries Near white matter
Cite this Entry
“White matter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/white%20matter. Accessed 23 Nov. 2024.
Kids Definition
white matter
noun
: whitish nerve tissue especially of the brain and spinal cord that consists largely of nerve fibers enclosed in a fatty material and that lies under the gray matter
Medical Definition
white matter
noun
: neural tissue especially of the brain and spinal cord that consists largely of myelinated nerve fibers bundled into tracts, has a whitish color, and typically underlies the gray matter
More from Merriam-Webster on white matter
Britannica.com: Encyclopedia article about white matter
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