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English definition of “sphincter”

sphincter

noun [C]     /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 muscle Substances and structures in the body
(Definition of sphincter noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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