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eustachian

adjective, often capitalized
eu·​sta·​chian | \ yüˈstāshən also -āshēən or -ākēən\

Definition of eustachian

: of or relating to Eustachio or to the eustachian tube : located in or adjoining the eustachian tube

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History and Etymology for eustachian

Bartolommeo Eustachio †1574 Italian anatomist + English -an

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