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grey substance is a noun meaning "greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons". It carries one recorded sense.
greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
Definitions, synonyms and semantic relations for grey substance come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.