Eustachian adjective. [ju:'steɪʃ(ɪ)ǝn] M18.
[from Eustachius, Latinized form of the name of Bartolomeo Eustachio (d. 1574) + -AN.]
Eustachian tube, the passage running through the temporal bone and connecting the middle ear and the nasopharynx, by virtue of which the air pressure is the same on both sides of the tympanum.

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