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Meaning of Eustachian tube

Eu•sta'chian tube"

Pronunciation: (y-stā'shun, -stā'kē-un), [key]
— Anat. Anat.
  1. a canal extending from the middle ear to the pharynx; auditory canal. See diag. under.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.