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Noun sphincter muscle has 1 sense
  1. sphincter, anatomical sphincter, sphincter muscle - a ring of muscle that contracts to close an opening
    --1 is a kind of muscle, musculus
    --1 has particulars:
     physiological sphincter; anal sphincter, sphincter ani, musculus sphincter ani; urethral sphincter, musculus sphincter urethrae; bladder sphincter, musculus sphincter vesicae; musculus sphincter ductus choledochi; musculus sphincter ductus pancreatici; pupillary sphincter, musculus sphincter pupillae; pyloric sphincter, pyloric valve, musculus sphincter pylori
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