eustachiantube

eu·sta·chian tube or Eu·sta·chian tube (yo͞o-stāʹshən, -shē-ən, -kē-ən) n. Anatomy

A slender tube that connects the tympanic cavity with the nasal part of the pharynx and serves to equalize air pressure on either side of the eardrum.

  [After Eustachio, Bartolommeo.]

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