Sphincter meaning

sfĭngk'tər
A ringlike muscle that normally maintains constriction of a body passage or orifice and that relaxes as required by normal physiological functioning.
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A ring-shaped muscle that surrounds a natural opening in the body and can open or close it by expanding or contracting.
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A ringlike muscle that normally maintains constriction of a body passage or orifice and that relaxes as required by normal physiological functioning.
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Origin of sphincter

  • Late Latin sphinctēr from Greek sphinktēr from sphingein to bind tight
    From American Heritage Dictionary of the English Language, 5th Edition