from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Whitish nerve tissue, especially of the brain and spinal cord, consisting chiefly of myelinated nerve fibers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A region of the central nervous system containing myelinated nerve fibres and no dendrites
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. whitish nervous tissue of the CNS consisting of neurons and their myelin sheaths
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