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white matter

noun Anatomy.
  1. 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).
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Origin of white matter

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for white matter

white matter

noun
  1. the whitish tissue of the brain and spinal cord, consisting mainly of myelinated nerve fibresTechnical name: substantia alba Compare grey matter
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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

white matter in Medicine

white matter

n.
  1. 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.alba substantia alba white substance
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

white matter in Science

white matter

  1. The whitish tissue of the vertebrate brain and spinal cord, made up chiefly of nerve fibers (axons) covered in myelin sheaths. Compare gray matter.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.