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The Adobe Flash Player is required in order to view this content. You can get it here: eustachian tubeOne entry found. Main Entry: eu·sta·chian tube Pronunciation: \yü-ˈstā-sh(ē-)ən- also -ˈstā-kē-ən-\ Function: noun Usage: often capitalized E Etymology: Bartolommeo Eustachio Date: 1741 : a bony and cartilaginous tube connecting the middle ear with the nasopharynx and equalizing air pressure on both sides of the tympanic membrane —called also auditory tube — see ear illustration 
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