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white matter

noun, Anatomy.
nerve tissue, especially of the brain and spinal cord, which primarily contains myelinated fibers and is nearly white in color.
Compare gray matter (def 1).
Origin of white matter
1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for white-matter

white matter

the whitish tissue of the brain and spinal cord, consisting mainly of myelinated nerve fibres Technical name substantia alba Compare grey matter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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white-matter in Medicine

white matter n.
Whitish nerve tissue, especially of the brain and spinal cord, chiefly composed of myelinated nerve fibers and containing few or no neuronal cell bodies or dendrites. Also called alba, substantia alba, white substance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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white-matter in Science
white matter  
The whitish tissue of the vertebrate brain and spinal cord, made up chiefly of nerve fibers (axons) covered in myelin sheaths. Compare gray matter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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