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:
1830–40

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Collins
World English Dictionary
white matter
 
n
Compare grey matter Technical name: substantia alba the whitish tissue of the brain and spinal cord, consisting mainly of myelinated nerve fibres

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
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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Example sentences
Scientists have suspected for more than two decades that schizophrenia is
  linked to defects in the brain's white matter.
Brain scans show that as people get older, the white matter typically
  degenerates.
They found that the white matter in the prefrontal cortex of chimpanzees does
  not grow as rapidly as it does in humans.
The white matter in the foremost frontal lobes, the so-called prefrontal areas,
  had been disrupted on both sides of the brain.
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