Eustachian tube

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Concise Oxford English Dictionary © 2008 Oxford University Press:
Eustachian tube /juːˈsteɪʃ(ə)n/

▶noun Anatomy a narrow passage leading from the pharynx to the cavity of the middle ear, permitting the equalization of pressure on each side of the eardrum.

– origin C18: named after the 16th-cent. Italian anatomist Bartolomeo Eustachio.

'Eustachian tube' also found in these Oxford entries:

glue ear

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Eustachian tube