sphincter
sphincter[ˈsfɪŋktə]noun- (Anatomy)a ring of muscle surrounding and serving to guard or close an opening or tube, such as the anus or the openings of the stomach
(剖)括约肌
派生sphincteraladjectivesphinctericadjective语源- late 16th cent.: via Latin from Greek sphinktēr, from sphingein 'bind tight'
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