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May 23, 2013
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Definition of White matter

White matter: The part of the brain that contains myelinated nerve fibers. The white matter is white because it is the color of myelin, the insulation that covers nerve fibers.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=6018
Last Editorial Review: 3/19/2012

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