Definition of “sulcus” - English Dictionary

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“sulcus” in British English

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sulcusnoun [ C ]

uk /ˈsʌl.kəs/ us /ˈsʌl.kəs/ plural sulci /ˈsʌl.saɪ/ specialized

a gap where the surface of a structure is folded, for example in the brain

(Definition of “sulcus” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)