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| sphinc·ter [ sfíngktər ] (plural sphinc·ters) |
noun |
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| Definition: |
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circular band of muscle: a circular band of muscle that surrounds an opening or passage in the body, especially the anus, and narrows or closes the opening by contracting
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| [Late 16th century. Via Latin< Greek sphigktēr< sphiggein "bind tight"] |
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 sphinc·ter·al adjective |
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