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English definition of “sphincter”


noun [C] uk   /ˈsfɪŋk.tər/ us    /-tɚ/ specialized
a muscle that surrounds an opening in the body and can tighten to close it: the anal sphincter a sphincter muscleSubstances and structures in the body
(Definition of sphincter from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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