Definition of Eustachian tube noun from the Oxford Advanced Learner's Dictionary

 

Eustachian tube

 noun
noun
BrE BrE//juːˈsteɪʃn tjuːb//
 
; NAmE NAmE//juːˈsteɪʃn tjuːb//
 
(anatomy)
 
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a narrow tube that joins the throat to the middle ear Word Origin mid 18th cent.: named after Bartolomeo Eustachio (died 1574), the Italian anatomist who identified and described it.
See the Oxford Advanced American Dictionary entry: Eustachian tube