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From Longman Dictionary of Contemporary English
Related topics: Human
sphinctersphinc‧ter /ˈsfɪŋktə $ -ər/ noun [countable] medical  HBHa muscle that surrounds an opening in your body, and can become tight in order to close the opening
Examples from the Corpus
sphincterthe anal sphincterThe sphincters become leaky, and the urine overflows.Thus it should not be assumed that older patients with ulcerative colitis have weaker sphincters than younger patients.
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