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Eustachian tube noun

  /ju.ˈsteɪʃən ˈtjuːb/ , /ju.ˈsteɪʃən ˈtuːb/
  • (anatomy) In humans and other land vertebrates, a tube that links the nasopharynx to the cavity of the middle ear to allow the equalization of the pressure on both sides of the eardrum.
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