grey matternoun [ U ]
US usually gray matter uk/ˈɡreɪ ˌmæt.ər/us/ˈɡreɪ ˌmæt̬.ɚ/specialized anatomy the darker tissue containing nerve fibres (= structures like threads) found in the brain and spinal cord
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white matter
informal a person's intelligence:
It's not the sort of film that stimulates the grey matter much.
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Substances & structures in the body
- abductor
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- agonist
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- gyrus
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- hilus
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The brain & nervous system
Intelligence