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A Writer's Dictionary:

sphincter Definition


Dictionary Home » Words Starting with S » spermatozoon ... spikier » sphincter


sphincter
noun
    1. anatomy.
      A ring of muscle that, when it contracts, closes the entrance to a cavity in the body.
Derivative: sphincteral
adj
    Of or relating to the sphincter.
Etymology: 16c: from Greek sphingein to hold tight.



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