eustachian tube

noun, often capitalized E
eu·​sta·​chian tube | \ yü-ˈstā-sh(ē-)ən- also -ˈstā-kē-ən- How to pronounce eustachian tube (audio) \

Definition of eustachian tube

: 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

First Known Use of eustachian tube

1741, in the meaning defined above

History and Etymology for eustachian tube

Bartolommeo Eustachio

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The first known use of eustachian tube was in 1741

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Cite this Entry

“Eustachian tube.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/eustachian%20tube. Accessed 9 December 2019.

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More Definitions for eustachian tube

eustachian tube

noun, often capitalized E

Medical Definition of eustachian tube

: 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, pharyngotympanic tube

More from Merriam-Webster on eustachian tube

Britannica.com: Encyclopedia article about eustachian tube

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