Meaning of “grey matter” in the English Dictionary

English

"grey matter" in English

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grey matternoun [ U ]

US usually gray matter uk /ˈɡreɪ ˌmæt.ər/ us /ˈɡreɪ ˌmæt̬.ɚ/

(Definition of “grey matter” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)