Definition of eustachian
:of or relating to Eustachio or to the eustachian tube :located in or adjoining the eustachian tube
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eustachian
adjective,
often capitalized
eu·sta·chian
\
yüˈstāshən also -āshēən or -ākēən
\
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Origin and Etymology of eustachian
Bartolommeo Eustachio †1574 Italian anatomist + English -an
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