English

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

 

sphincter

 noun
noun
BrE BrE//ˈsfɪŋktə(r)//
 
; NAmE NAmE//ˈsfɪŋktər//
 
(anatomy)
 
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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 Origin late 16th cent.: via Latin from Greek sphinktēr, from sphingein ‘bind tight’.
See the Oxford Advanced American Dictionary entry: sphincter