sphincter - WordReference.com Dictionary of English

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- - sphere
  - spheric
  - spherical
  - spherical aberration
  - spherical angle
  - spherical coordinates
  - spherical triangle
  - spheroid
  - spherule
  - spherulite
  - sphincter
  - sphingomyelin
  - sphingosine
  - sphinx
  - sphygmo-
  - sphygmograph
  - sphygmomanometer
  - Sphynx
  - spic
  - spica
  - spiccato
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sphincter

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Concise Oxford English Dictionary © 2008 Oxford University Press:
sphincter /ˈsfɪŋktə/

▶noun Anatomy a ring of muscle surrounding and serving to guard or close an opening.

– derivatives
sphincteral adjective,
sphincteric adjective.

– origin C16: via L. from Gk sphinktēr, from sphingein ‘bind tight’.

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