grey matter
US /ˌɡreɪ ˈmæt.ər/
UK /ˌɡreɪ ˈmæt.ər/
1.
the darker tissue of the brain and spinal cord, consisting mainly of nerve cell bodies and branching dendrites.
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The neurologist examined the patient's grey matter for abnormalities.
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Damage to the grey matter can impair cognitive functions.
2.
intelligence; brains.
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You'll need to use your grey matter to solve this puzzle.
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It takes a lot of grey matter to become a successful scientist.