Definition of sphincter noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsfɪŋktə(r)//
; NAmE NAmE//ˈsfɪŋktər//
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a ring of muscle that surrounds an opening in the body and can contract to close it the anal sphincter Word Originlate 16th cent.: via Latin from Greek sphinktēr, from sphingein ‘bind tight’.
See the Oxford Advanced American Dictionary entry: sphincter