grey matter

World English Dictionary
grey matter
 
n
1.  Compare white matter Technical name: substantia grisea the greyish tissue of the brain and spinal cord, containing nerve cell bodies, dendrites, and bare (unmyelinated) axons
2.  informal brains or intellect

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
grey matter

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