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sphincter

noun
/ˈsfɪŋktə(r)/
/ˈsfɪŋktər/
(anatomy解剖学)
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  1. a ring of muscle that surrounds an opening in the body and can become tight to close it括约肌
    • the anal sphincter肛门括约肌
    Topics Bodyc2
    Word Originlate 16th cent.: via Latin from Greek sphinktēr, from sphingein ‘bind tight’.

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