gray substance

Medical Dictionary

gray substance n.
See gray matter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
gray substance

noun
greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons [syn: grey matter
WordNet® 3.0, © 2006 by Princeton University.
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