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English definition of “grey matter”

grey matter

noun [U] (US usually gray matter)    
specialized anatomy the darker tissue containing nerve fibres (= structures like threads) found in the brain and spinal cord → Compare white matter informal a person's intelligence: It's not the sort of movie that stimulates the grey matter much.IntelligencePerceptive
(Definition of grey matter noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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